I've usually (in the UK) had 1 month's notice upon quitting and spent it doing documentation updates and handover meetings. I managed to use pretty much the ent

I've usually (in the UK) had 1 month's notice upon quitting and spent it doing documentation updates and handover meetings. I managed to use pretty much the entire time productively - though admittedly one could make a good argument that that was because I hadn't been making time to document things better previously. I've known quite a few senior developers with a 3 months' notice period baked into their contract.