How long is possible

[coolhandcountry]

I want a new project. I am thinking of trying to get the most runtime possible out of a brushless. I want fair speed good or great runtime with pretty relible system. I was thinking lipo but don't want the big huge packs like 12000mah. I like to run like 4000 pack or so but will go 8s. I was wondering if a 14 or 16 xl motor or should I stick with a Lcan. I was wondering to if a xl1200 would do the trick.