I've read 10% to 15% could be considered normal during mating season. So if you have 60,000 bees in a normal hive, that could be 6,000 to 9,000 drones in a hive. There has been a time or two when I have had a frame that looked like it was almost entirely covered in drones (and I knew for sue i didn't have a laying worker.) Unless you think you have queen problems, I would like the hive make what they think they need.
ld