I'm a massage therapist, rarely does anyone come in for a 30 minute, and if they do they usually have a gift card and are doing exactly what you talking about. But I won't even attempt to do a full body in 30 minutes, especially since a 30 minute is really 20, a 60 minute is really 50. I have them pick an area they need word on, that's generally neck and shoulders or back. I had one guy who came in for a 30 minute massage that just wanted work on his legs, but that only happened once.
FYI 90 minutes are the way man. Especially if you want a full body massage and you want deep tissue. 60 minutes is fine for a full body relaxation but if you have actual problems you need worked on, deep tissue work, I'd go 60 minutes just upper body....well or lower if that's where your problems are but that's rare. 90 minute sessions are my favs though, hate 2 hour ones, I'm bored and drooling during those.
Why O why call it 10 minutes less than it really is!!!!!!!!!!!!!!!