Congratulations! With that many Russians you will have nests for sure. There are usually 4 or 5 eggs to a clutch, but sometimes the girls can lay more than one clutch. So watch out in a couple of weeks as well, there may be more hatching!
I have a very large enclosure for my Russian herd. I am always hoping that I will find a baby in the enclosure. My oldest female laid eggs a week after she was given to me (2 years ago). However, I knew they were not fertile because at that time she had never been with a male tortoise. She has spent two summers now with an adult male and I have seen them mate. So if she laid eggs they did not hatch. Another one of my adult females laid eggs around two months ago (which I incubated), but they did not hatch. If I had not seen her covering up the eggs I probably would not have known she had laid eggs as they are so clever at hiding any signs of having dug a nest.
The enclosure is very large and has lots of sunshine, shade and in between. I don't know if perhaps I water it too much or if my male tortoise is just not doing his job properly.