My preferred time length these days is 30-45 minutes; however these are my longer favorites (not necessarily in order):
1.
STRENGTH
Jari's original Get Ripped
Jari's Ripped to the Core
KCM's 30 Mins Weights (combined premix)
KCM's NYC
Cathe's Muscle Max (the premix that's about an hour - I'm not a big Cathe fan but I like this)
Gilad's Cuts and Curves (doesn't include specific abs)
Rob Glick's Strength Training
Firm Super Sculpting (~50 mins)
2.
CIRCUITS
Michelle Dozois' Your Best Body Circuit (1 hr)
KCM's Shape of Things to Come (50 mins)
KCM's 30 Mins Bootcamp (the combined premix, 1 hr)
Firms - so many! Vols 1, 2, 3, 6, Strength, Cardio, Total Body Shaping Mix, BSS1 Cardio Sculpt, BSS2 CAWT (plus I'm sure others I can't think of right now)
Jari's Ripped 1000
Cathe's High Step Challenge (but I modify a lot, lol)
I'm sure I'll think of others but these are off the top of my head.