If I had an engine or piece of equipment that was requiring me to change oil every 3 weeks using normal oil I would be switching to synthetic. You can go 3 times as long on a change.
If you take Colorados advice and go 150hr or so that would get you to a month on regular oil so if you switched to synthetic you could reasonably get a couple of months between changes, maybe 3.
If you are noticing that the oil that you are currently using is comming out reasonably clean that is a pretty good indicator that you can go a little longer.
I am suprised that a musician as yourself would be risking hurting your hands or fingers doing stuff like this, be careful.
Switch to synthetic go 2 months send off a sample. Bet you find you can go even longer.
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