My contract is for 38hrs a week so I work 38hrs a week. Teams I've been on have had "crunch", ie. team members working back late in some misguided effort to ship "on time". What I find interesting about this is that management never asks for it, it's just implied.

I've got the "oh you're leaving" when I get up at 5pm and leave, but never pulled aside by management for it. I don't really understand why others partake.

They'd have to incentivise the hell out of me to get me to do that.