"how much do you have your hands on "
Is that a trick question, something like "How many margueritas is enough?"
Really though, I think it is just a question of your personal comfort level. If you want to lay back and don't care if the boat wallows a bit, you let it wallow. If you're awake and don't mind keeping busy, maybe you play the traveller, or the main sheet, continuously. And you hold off on anything else that might fill your hands.
You're in cruising mode, so, you do what makes YOU happy.