That's a bit of a non-answer. Your answer is also quite common in places which do require basically formal/informal "on call" time, so it's hard to know if you're different from other ones.
It's also an honest answer. We do have an on-call rotation for emergencies, which are very rare. If you're busy, pass it on to the next person on the list. I'd say our team spends about an hour a month total on these.
