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Usually a servo wheel turns about 90 degrees. The below situation gives about 26 degrees up and 8 degrees down. The longer the aileron horn the less it will move the aileron either up or down. More up than down is preferred for the aileron.
The position of the servo (the point of push rod
attachment on the servo wheel) wheel in relation to the aileron horn
also has a lot to do with the amount of offset for the pivot on the
wheel and on the aileron horn. Each situation is diferent so I would
suggest a sketch as accurate as possible (similar to below) to get the
desired result. Remember that little or no down aileron with mostly up
is preferred in a model. Too much down acts as a brake so that instead
of lifting it actually stalls (at certain conditions, ex: at high angle
of attack) out that wing causing a turning dive in that direction instead
of the desired turn to the opposite.