great to see the support for deep-tissue work around here (since that's what I do)!
Pete - you already know this, I'm sure - some gentle range-of-motion stretching will really promote the flushing / removal of the released waste products.
MatthewD - more than an hour is rare: it's physically very hard to do bodywork - especially on a person w/ a well-developed musculature. One of the things that got me into serious lifting was the need to be strong enough to do a full day's work without ruining myself! One of the reasons leverage is so important.
BioMan - $90??? Maybe I need to move: too many MTs around here, even w/ my 30+ years.... What part of the country are you in? Yeah, it's not so much the toxins as it is the effect on the nervous system: *too* much work can cause a person to go into tetany (as in tetanus - full-body muscle lock!).... That's why an MT or other bodyworker won't dig into *everything* in one session.
A note on getting student work (in or out of a school clinic): deep-tissue is powerful and can injure if the practitioner isn't well-trained and supervised, so be careful - and don't ask for too much! My right shoulder got fucked initially in a motorcycle accident, but I asked a student to dig into it during a final evaluation (a hands-on final exam) - it felt great, so my attention wandered...until my arm fell out of my shoulder! Took me years of re-training (and literally dozens of re-injuries) to repair the damage & make my shoulder functional again.
Not trying to scare anyone away, here - just be careful, just like you were choosing a coach, a spotter or a mechanic (in a sense, you're doing all 3).