Two eggs are usual for leopard geckos. People who have many eggs hatching at the same time also have many geckos laying 2 eggs at a time. The geckos can lay 2 eggs as many as 10 times or more in a season.
Out of curiosity, if a gecko lays one or two eggs at a time and can lay up to 10 a season, to get ten do the male and female have to get together five or so times? Or is one copulation enough to fertilize all possible eggs in a season?
Once is enough. The female can retain sperm for a long while. Two eggs per clutch is the norm, but I have seen evidence of up to four (one infertile) in one clutch.
I actually had a female this year (Bell Hybino) that laid 22-30 eggs (she was housed with other females for what could have been the other eight, I believe for sure that she laid 4 of them though) but a lot of the later ones turned infertile as I did not re-breed her. So, just because leopard geckos can contain sperm doesn’t mean they can’t use it up. I’d re-breed every 4-6 eggs for best results.