(Not FIREd, so talking about leaving jobs in general)
When I was working for a boss from hell in a job that was making me ill, I was coasting before I'd even found a new job. I didn't respect her, the company wasn't all that, and no-one was having to pick up my slack (stuff didn't get done, but no-one suffered). I gave my four weeks notice the week before a massive event when I'd already booked three weeks' holiday. I explained she could either have no hand over or the event collapse and she should pick one. When she offered to give me two weeks' pay in exchange for working an extra week after the holiday to hand over I laughed in her face. I deleted some of the work I had done from the shared drive and my laptop because I knew it would be a pain to do again and I already had my reference letter. Good times, looking back I think I would have worked even less (and I was seriously slacking, I planned my entire wedding in work hours).
When I was leaving the Air Force I spent about six months responding to bullshit task requests with 'Nope, what are they gonna do, fire me?' And also breaking the intention of my contract by working a second job (it wasn't the letter because I was working for free in exchange for a massive sign on bonus the day after I became a civilian). I'd do the same again.
However when the funding ran out for the place I was volunteering for, I was working hard, every hour, bringing extra work home so that we could do as much as possible before the programme was culled. Again, I'd do the same thing because I'm really proud of what we achieved in that time.
When I get offered dull-sounding training or networking I only attend if I think it'll make or save me money in the next decade. (I'm including free drinks in money saved).
@Mr Green, I'd think about all the things that you can do while sitting in your chair, and looking at a first glance like work. Start a blog? Listen to podcasts, research cool places you'd like to travel. If possible try to make it productive on some level as spending the day wasting time really drags. Do you know anyone with a personal project that could use some remote assistance with? Are there any side hustles you could run from your desk without getting caught breaking your contract?