I can give you some info how we do it on the 4HP24 on a 750.
2-3 guys, even if they just lend you a hand to remove exhaust, tranny is helpful.
Equipment we have you can see here
http://www.bimmerboard.com/forums/posts/309930/
Changing a tranny on a 750: from morning 8-evening 8, including lunch break.
We are not in a hurry.
Time for a complete reman of the tranny when it is out of the car:
valve body: half day
rest 1 day, with breaks in between.
We have a 20 ton press to push out some parts, compressed air (see the repair manual, you need that), some pressing tools made by ourselves from pipes.
Yoy can see about 50 pics of such a repair on my website below.
We have done that now several times, first time took of course more time.
All depends on the tools you have and the equipment.
If you do the repair on your own, maybe after work in the evenings for some hours every day for one week should be enough.
Of course, all depends on skills, tools.......