Day 4 the seeds are just starting to sprout. Keep rinsing them.
Day 5 the shoots were longer and I placed them under my growing lights because the sun was nowhere to be found. This will turn the little leaves green.
When the leaves are green, which happens really fast, for me it was at the end of day 5, you can start eating them. I used mine in a cheese sandwich and I have some left to add to my salad tonight for dinner. I don't know how long they will last in the fridge but I think they are quite fragile and should be used within a day or two after the leaves have gone green.