Ram-bro,
I am using Thunder Power gen 2 & 3 packs. They are 6S 5000 mah packs in Series for a 12S setup. I have used this setup on numerous planes and get 6 to 12 minute flights depending on how hard I push them. I usually like to keep the flights to around 6-7 minutes just in case I don't setup well for my landing and need to go around again. I think my average once I get on the ground is about 8 minutes. Again, if I just fly around at half trottle the whole time I can go 12 minutes or more, but that's no fun
Jeff