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Two astronauts marooned in space may sound like the plot of a Hollywood blockbuster, but for two crew members, it is now a reality. Commander Barry Wilmore and pilot Sunita Williams are currently in limbo on the International Space Station (ISS).

They arrived in the Boeing Starliner spacecraft – the first test of the spaceship with astronauts. Wilmore and Williams were supposed to stay on the ISS for around eight days and return on the same spacecraft. But there is now debate about the safety of Starliner after it experienced on its way to the ISS.

In coming days, Nasa and Boeing may decide to clear Starliner to carry the astronauts back to Earth. This means their stay might not last too much longer. But if officials decide against Starliner, the astronauts face waiting an before returning. So how do astronauts cope with a potential six-month wait for a lift home?

at the best of times. Under normal circumstances, it is . But in extreme situations, with high stakes, .

Part of the reason that waiting is difficult is that it distorts our sense of time. Think of last time you were waiting for a delayed train, test results or a text from a potential new partner. Did it fly by or drag? For most people, time spent waiting crawls at a glacial pace. As a result, delays and periods of anticipation often feel much longer than they actually are.

Waiting slows our perception of time, because it changes the amount of time that we spend . During normal daily life we often ignore time; our brains have a limited capacity. If time isn’t important, we simply don’t think about it, and this helps it to pass quickly.

When we are waiting, our desire to know when the wait is over increases how much we think about time. This “clock watching” can make the minutes and hours feel like they are . Stress, discomfort and pain exacerbate this effect, meaning that waiting in difficult situations .

Waiting also slows our perception of time because it what we do and how we feel. Normal life is busy and full of ever-changing activities and interactions. The sudden need to wait halts the flow of life, often leaving us with nothing else to do, thus increasing levels of boredom and frustration.

In general, time filled with activity . We all got a taste of this during . When we were stuck inside unable to see friends and engage in normal daily activities, the loss of routine and distractions caused time to drag for many.

For the astronauts stuck on the ISS, anxiety about when they will return, limited opportunities for activities and fewer opportunities to contact friends and families combine to make their wait to return home feel significantly longer than six months – if it should come to that.

However, as academics who research the effects of time on human psychology and biology, our new, shortly to be published on crew members at research stations in Antarctica aims to shed light on whether waiting in extreme environments is different to waiting during normal daily life.

A year in Antarctica

While being stuck for six months on the ISS may sound like many people’s worst nightmare, it is not uncommon for scientists to spend long periods isolated and confined in extreme environments. Every year, organisations such as the Instituto Antártico Argentino (which uses the Belgrano II Antarctic station), the French Polar Institute and the Italian Antarctic Programme, in cooperation with the European Space Agency (which all use Antarctica’s Concordia station), send crews of people for up to 16 months to conduct research on the frozen continent.

During the March to October , teams spend six months in near darkness – and from May to August, in complete darkness – facing outside temperatures of up to -60C, wind speeds of 160 km/h (100 mph) and storms which prevent almost all outdoor activity. Limited internet coverage can also prevent constant communication with the outside world.

For the last year, we have researched how life in Antarctica influences people’s experience of time. Each month, we asked crew members how time felt like it was passing in comparison to before their mission. Trapped on base, with limited contact with the outside world, you might expect time to drag. However, our results suggest the opposite may be true.

Analysis of crew members’ experiences indicated that being constantly busy with complex tasks such as scientific research helped time to pass swiftly, according to 80% of crew responses. Only 3% of responses indicated that time actually dragged, and these reports occurred when nights were long and there was little to do.

These experiences may provide hope for those stuck on the ISS. Like life on an Antarctic station, these Nasa astronauts have a busy and mentally demanding existence. These factors may help time to pass quickly.

However, a key factor of their wait may be their ability to of when they will return. Wilmore and Williams will spend their time in a space equivalent to the plane. But better information about “when” things will happen and “why” delays are being incurred can help people to tolerate waiting and reduce its impact on their wellbeing.

Ruth Ogden receives funding from The British Academy, The Wellcome Trust, the Economic and Social Research Council, CHANSE and Horizon 2020. This piece was written as part of the Wellcome Trust Project “After the End” 225238/Z/22/Z. The work reported in this article is in collaboration with ESA and IIA as part of the SPACE-TIME project.

Daniel Vigo is a research career awardee from the ³Ô¹ÏÍøÕ¾ Scientific and Technical Research Council (CONICET) and a senior professor at the Catholic University of Argentina (UCA). The work reported in this article is conducted as part of a collaboration between UCA, CONICET, the Argentine Antarctic Institute (IAA), the Joint Antarctic Command, and the Health Coordination of the Defense Ministry, under the frame of an agreement signed between the European Space Agency (ESA), the IAA, and the ³Ô¹ÏÍøÕ¾ Commission on Space Activities (CONAE).