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Spending another month just to by souvenirs might probably be too much but in truth, it isn't
To them, one month's barely enough to get everything they want. Raven already got everything that he needed so he just allowed his friends to shop for things.
The rest are clearly excited, they're going home. It has been quite sometime since they left, in fact they got so used to their current lives that they almost forgot that they left people behind. If it weren't Raven's reminder, they would've not even consider the idea of going back.
If they don't return to they home, their yearnings will eventually turn into a element that will prevent them from reaching greater heights. That's why Raven wanted to get rid of that.
They ended up extending the time to a month and half, delivering the items they wanted will take some time so they could only resort to that.