It's from the time you've noticed the little outgoing dimple. It is good that he is noisy, shows lots of strength and it gets the blood circulation going so the yolk absorbs. It's your call now, and we can only give you suggestions. You can wait until tomorrow and see if he has made any further progress. I would prefer that, because sometimes they need just a little bit longer. If he has not made any further progress tomorrow then it is time to help a little bit. You can also take a look now, but then you have to be prepared to stay up for a few more hours. What you can do is break a little off the shell away and see how it looks like inside. Does it look like the membrane around the duckling is very white. That can indicate that it is shrink wrapped, because the membrane turns more white when it does it. If yes, then you should peel the shell about 1/3 off and take a toothpick and tear the membrane. You must stop when you see blood, because then it has not absorbed the yolk yet completely. It that happens wrap the egg and a wet towel and put him back in for a few more hours (4-6). Come back later and start again. Do not go past the half mark of the egg, and do not try to pull him out. If he does not come out at the half mark then he just needs to sit there until he does.