minimum playtime to group at later levels?

[Seeatee]

at lower levels when everything is easier it is fine to join groups when you have 30 or 40 minutes to play, but as you level up putting groups together gets hard and takes longer, its harder to get to the camp, hander to find replacements etc, I often see people complaining because someone joins a group then leaves a half hour later.

from level 45+ how long should you be able to commit to a group before going LFG? is this time different for key classes like tanks and clerics than it is for DPS?

I know me personally if I don't have at least 3 hours to commit to the group I don't like to go LFG, but curious to see what others think about this.