Hi remmy
we did our snags over a week, which was alot better cos you noticed more things as you went round
to be honest there were no mega problems - the worst things we had were a scratched sink and we had a socket that tripped the whole electrics - both of which needed replacing
if you have problems with your grouting, dripped paints, plaster everywhere - which we had and is quiet common - you are probably better off doing this yourself, and just leaving the stuff that you cannot do to the builders
for example we had some loose surrounds around our taps, scratched kitchen door handles, cracked tiles on balcony, split beading on wardrobe/room doors, rusty grills - our list was quiet long but they were quiet easy things to solve - we have only been back just over a week and the majority of them have been done already
just make sure you have silicon around your bath and shower tray as we did not, have this just tile grout, we just went to a ferenteria and got some and did it ourselves
hope this helps
rgds
saz