As there is a certified version of the airplane, you can be pretty confident that the intended control deflection for your non certified one, will be very similar, or the same as the certified one. The maintenance manual for the certified one must give travel range and rigging instructions. That's your starting point.
In general, aileron travel will be limited to around 20 some degrees in the greater travel direction, and may be less to none in the opposite direction (Tiger Moth). A travel range exceeding 30 degrees would be aerodynamically very unusual. For reference, in Canada, flap extension angles on amateur built airplanes is not permitted to exceed 40 degrees. So if you're anywhere near that, you're way away from where you should be.
For sure, ask questions. too much aileron travel, and an aerodynamically stalled aileron will make for a very unpleasant to fly airplane!