I play in dungeon turns behind the screen, when the party is exploring a dungeon or dungeon-like environment, but my players are not aware of it directly. The players are aware that the longer time they spend at a location, the more wandering monster encounters they might have, however. Working in 10 minute blocks is just a simple way to track time and trigger random encounter rolls. Usually works well with spell effects, too. You know a spell last 1-10 minutes has expired when you tick off another turn, or 6 for a 1-hour spell.