The temperature that you should fry crappie at is 350 F degrees.
Get the cooking oil up to 350 F temperature and then once the cooking oil has reached the 350 F temperature then put the crappie into the fryer or the cooking oil.
The time it takes to fry crappie depends on how well done you like your crappie but you cook or fry the crappie until it's golden brown or has the desired texture you want.
Usually frying the crappie for 3 to 6 minutes is enough but some people may want to fry their fish a bit longer.
After 6 minutes the crappie should be done enough to eat but if it's not done enough for you then continuing frying the crappie until it's good enough for you.