from what i've seen, the scooba wetness is comparable to mopping. the solution evaporates at the same rate as you would expect any water to evaporate - approx. 20-30 mins, although i'm sure that depends on your local humidity (i'm in atlanta, so it probably takes a little longer to evaporate here than it would in say british columbia). that said, mine seems to be drying in less than 20 minutes. for example: when i put scooba in my kitchen and block it with a VW (approx 8ft. by 8ft.), the floor will be mostly dry after scooba has done it's little self-drying thing and then beeps at me to come get it. i've only been using scooba for about a week, but as my roommate loves to remind me, i only rarely mopped the floor before, now scooba is being run daily haha. my retort is that scooba will run til the dirty water is as clear as the clean water...haha.
one other point: i have two dogs, and their water dish has been sitting on my laminate floor for over 4 years now. they are always dripping, drooling, and spilling on the floor and so far, the floor has held up like a champ...
i agree with thermidor - i would love to hear from someone who has had actual damage from the scooba on their floors...not just irobot covering their asses