Encounter based power or Just Proof that Listening is hard?

[jodyjohnson]

Maximum Length Of Time For Listening: Only three attempts can be
made before the strain becomes too great. After the third attempt, the listeners
must cease such activity for at least five rounds before returning to listening again.

5 rounds in 1e AD&D equal to 5 minutes or one 4e encounter.

If Listening is that hard what else is hard enough to be limited to once per 5 minutes?