I would depend on the differences in temperature between the inside of the incubator and the outside of the incubator. The greater the difference, the quicker the condensation provided that it is hotter on the inside than it is on the outside.
I think.
I may not be very smart, but what if I am?
Stinky says, "Women should be obscene but not heard." Stinky is one smart man. www.humanewatch.org