if the eggs did not hatch how long until they lay again

Usually takes the females around a month to lay again depending on age and size of female. Smaller takes less time as they lay less eggs and vise versa. My young albino longfin female layed 3 weeks after her first spawn but she's still small

Normally 3-4 weeks but sometimes can take 5 weeks at the very most.....
But mine are the same as Kfenks......every 3 weeks.........