When they need it. Have they sprouted out of the soil yet? What size pots? What type of medium? Weather?
Did you water the whole pot or just a bit around the seed?
No one can specify when and how much from your question without some info but a seed in a pot that has been fully watered may not need water for a week or longer.
Seeds haven't sprout out of soil
I germinated them with paper towel method
I through some drops at the place where i put the seed
Soil : biobizz lightmix
Temps in morning 20c-23c
At night 15c
Almost every day i through some drops in the morning. Same thing did last year and
i had a success