They can extend the flight for another two days if they have to. The crew really likes it when that happens because they finally get some serious zero g play time!
Yup, being an astronaut seems to be simultaneously the best job and the worst job in existence today. Ernest Shackleton could have written the advertisement: "Long hours. Low wages. Extreme hazards. Small chance of fame in case of success."
What they don't tell you is that the job involves seemingly endless hours spent in review meetings and even more hours invested in training that you hope to God you'll never need. Through it all, they somehow manage to keep a positive mental attitude going almost all the time.