I have been keeping crappie and gills all summer long and have had none die on me.
I went out today and kept 10 big gills. I threw them in the live well and turned on the aerator. Surface temp was 84. I left the lake at 11:30 and drove home (20 min. drive). When I got home they were still rockin' in the well. As I said, I have also had no problems with crappie...even 45 min. drives home.