3 weeks.

During those 3 weeks I also voluntarily worked 7am-11pm on some of those days due to the department being short on staff. Bear in mind it also took me an hour and half to get to work so I'd be getting home at around 00:30am and leaving again at 5:30am - needless to say I was pretty wrecked on those days.

I did get a metric smurf tonne of time off in lieu for it though. Which was nice.