To OP
I had a brand new TL washer/dryer set that I bought at Best Buy in 2002 (sold to my sis 3 years later and got a Duet set)...At any rate. I had just moved into an Apartment in 02..(bottom floor of a 3 level apartment building) I noticed the EXACT same thing happening with my Whirlpool dryer and it took a while to dry too (over 60 mins)...I would have to vacuum lint out of the inside of the dryer. I think the dryer exhaust went straight up three levels..How that's a code violation I do not know, but it did the same thing your dryer is doing. When I moved into this house in late 04, the dryer did not do this at all. No lint inside (except lint screen of course).....Strange that some people with proper venting who have this SQ dryer are having that same problem, because that's one of the very symptoms of a clogged vent.