[thelonelygod]

For higher than 30 minutes you really want to look into planes instead of quadcopters. Running 4/6/8 heavy duty motors forces battery life to be an issue.

A plane has significantly less than that which lets them go for longer.

[kenrikm]

Good point Skywalker X8 or 1900 are good for longer range FPV planes, I've seen some setups with 80-100km range (UHF Setups) which is pretty impressive.

[commandar]

A fixed wing can also generally run its single motor at lower power most of the time, which contributes as well.

[larrydag]

Perhaps incorporate solar panels to the wings?

[commandar]

People have looked at it, but I think the general consensus is that there's not enough surface area on the airframe to generate enough electricity to make a significant impact.

Depending on the exact motor+prop setup, peak draw of between 200-400W is pretty common for fixed wings in the 1.5-2M wingspan range, and cruise is often around half of that.