I have a 30 gallon live-well with bait-well built into one side. I have my pump on a timer and pump in fresh water every 1, 3, or 7 minutes depending on air temps and volume of fish in live-well. Pump runs for 1 minute then shuts off for 1/3/7 minutes. I don't have any trouble keeping fish alive.
When camping for the weekend the minnows stay in the live-well all weekend. The boat comes out of the water and sits on my trailer in camp with me for about 16 hours a day. I use a Mino-Mizer to keep the water aerated and cooled while off the lake. I also keep the sun off the live-well to help keep it cool. If temps are in the 90's+ I throw a couple of ice cubes in there once in a while too. Or I'll add a gallon or two of campsite well water to flush the ammonia generated by minnows. All fish get cleaned at the ramp when fishing is done.
I run a Crappie Club and we hold 7-8 tournaments a year. I like to camp on tournament weekends, especially for the further away lakes. Keeping fish alive has not been a problem for me here in Central Illinois. We don't see too many 100+ degree days.
HOI Crappie Club
Where family and friends come to compete for a little more than bragging rights.
Quick, someone teach me how to fish so I can win this tournament!!!