EP - When is supply established?

RebeccaLovesChris

I EP and LO is 12 weeks (will be 3 months on the 14th).  I went from pumping 7 times a day down to 4, due to my work schedule since it is tough to do.  My supply is still great, getting 30+ ounces a day.

My question is if dropping down to 4 a day will screw me up.... I know it is impossible to know for sure.  But if my supply is established now, does that mean I can stick at the 4 pumping and do everything the same and my supply will remain?