I'm trying to take lessons at least 1 or 2 times a week, but my CFI is on a well deserved vacation. My question is it OK or bad form to have another CFI at the same school fill in one week so I don't go 2 weeks without flying? For reference, not that it matters... I'm a 53 year old student pilot. I work a bunch of hours in the investment world so my schedule is incredibly busy. I'm in no rush or a hard timeline, I just don't like to be inefficient. BTW my CFI is fantastic!