How long do you soak your seed

This is my second attempt at growing microgreens. My first attempt I soaked my seed for 12 hours, 3 days of darkness and about 10 days of using artificial light. This time I only soaked them for about 8 hours but I had to leave them germinate in darkness for about 5 days and this is the first day under light and they seem healthier and I found less moldy seeds. How long do you recommend?

Also I am using dwarf grey sugar peas.