As long as you “plan your dive and dive your plan” and allow appropriate surface intervals you can do 3 in a day without much trouble. Modern dive tables and computers are pretty solid. Typically you do your deeper and/or longer dives first and adjust your intervals as needed. Add some decompression stops to every dive for extra safety and you should be totally fine. Doing extended trips of 3 dives a day id be more careful and work in rest days and more conservative plans and be more careful with exhaustion levels. Every persons physiology is different so you can never be sure, but a conservative approach and common sense will keep you safe.