Hey, what sort of running time could I achieve with a 'NC flight battery,6/600 mAh' with a 'PERMAX 400/6V' motor and 2 x 'Tiny-S servos'? The capacity doesn't seem that much to me but I don't know much about planes and even less about electrics for them.

There are a lot of factors that will eat up available battery current. Aircraft weight (total), your throttle management, binds (if any) in the servo controls, and so on. It's tough to just pick a number from a specific battery/esc/motor combination without knowing more about what is going on and how you fly the plane.

For instance, when I started out with electrics, I was expecting 10 to 12 minutes of flying time, but got only three or four. I wondered why until I learned a bit about throttle management. That number increased to about 9, so far, with that particular plane, motor/esc/battery, and servo setup. Yours will differ from someone that has the same setup as you do. Best thing to do is just fly it and learn how to fly with minimum battery use (throttle management).

DS.

Like he said!

Remember that the weight of the plane and the prop you select to match the motor are the biggest influencing factors.

Think that the prop you select determines how much power is consumed and how fast.

The manufacturers specs in turn tell you how much "draw" the ESC and motor will tolerate.

The idea is to select a prop that keeps the motor and ESC under the limits, while giving you the best mix between flight performance and run time.

You can sacrifice run time for performance, or vice versa.