Hmm, I get mad when it takes 10 minutes to put back on.. but 5 hours jeesh.
My ZX6R is a sinch, I've got that down to seconds.
I can hardly offer much good advice but I'll try.
Usually I have a 2x4 under the tire or something to prop
it up so I don't have to manually lift the tire, takes some work load off.
That spacer and brake bracket are a pain in the ass though, for sure.
I know what you mean where it looks like theres not enough room between the 2. There is.
I think what I found to work pretty well last time was, take out the right side spacer, put the caliper on the rotor/wheel.
I roll the wheel forward up against the swingarm, (you know, like shortening the wheelbase, if you will).
Pull the caliper as far back as you can and put the spacer in the wheel. (With the wheel all the way forward and the caliper all the way back, it should give enough room to put the spacer in)
If you get it on, start putting the axle through to keep the wheel in place, otherwise it'll all move and the spacer falls out again.
It's not easy, but you eventually get it.
It's early and i'm tired so apologies if this is jibberish