if yoiur looking at getting rid of the snake mess undr the manifold and all the throttle body heater worthless junk, Id say about 2 hours, not counting time for running to pick up parts such as gaskets, heater hose and vac hose
more if your gonna clean parts while
someone might say faster, someone longer dut depends on skills, attitude
Id service the icv whiel its out, its easy to do
check out tjts1 threads at R3v. thers plenty of info and pics to help
or this thread on this forum , good pics, but hes replacing crap that is junk, follow the pics at this thread and the ones on delete throtlle body
http://m42club.com/forums/showthread.php?t=6334