First time starting radish from seed

So yesterday I made some soil blocks and started some crimson globe radish seeds in them. I woke up this morning to check on them and in less than 24 hours low and behold half of them are already sprouting and poking through the soil. The days of germination on seed package said 4 to 6 days. I was amazed to see that they are already popping. I did use a heat mat under them and they are inside. Is this just luck are do radishes just sprout very quickly I am not complaining about the fast germination rates just really dumbfounded i guess. Oh and should I keep them covered or take it off now that they are poppin out what do you guys and gals think sorry for the dumb Question just never did alot of my own starts, But now that I am home all the time I growing my own starts for me ,my friends and Mom. Got to take care of Momma . Thanks guys have a wonderful day.

put them in the garden

yes, they sprout very quickly for me, usually 24-48 hours. they want to grow!

They want to grow for sure. I will be getting them in the garden very soon just gotta harden them off for a bit.