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2-10 days, if they are snail eggs. I would think that they are snail eggs if they are in a cluster. Ghost shrimp eggs should be singles and I don't believe they even lay the eggs but wait til they hatch and then the baby ghost shrimp swim away and hide. I would take the eggs off the glass and put them in something that is easily contained. They will multiply faster than you ever imagine. In 6 weeks after I got my first ramshorn snails I had 6 clusters and hundreds of babies. Then got 3 mystery snails and wound up with well over 500 hundred even after I tried to isolate them.
Don't be afraid to post here. I do it and have learned a ton from the people that are here to help.
They're snail eggs, ghost shrimp carrying the eggs in their abdomen inside the finnerets to fan them. Unless you have another apple snail I wouldn't worry about those eggs, they'll be fish food in no time.