I got my PhD and I am starting on the 2nd October.
I am from Portugal and I would like to, once in a while, spend a weekend in Lisbon. I man, if I leave on a wednesday and come back on sunday will they make a problem? What are your experiences on this?

Flexibility will depend on your subject i.e. if your PhD is in science and your work lab-based then, by necessity, you'll need to work in the Uni much of the time. However, you are entitled to holiday and long weekends should certainly be possible.

I meant "I mean" not I man. Don't get me wrong!

Thank's everybody, I have already those increased nerves already.
Bought my plane ticket, that means (not man) that it is definitively true!

Good luck, man!