The chemicals in open tray will balance to the ambient room temp, in my darkroom the temp and humidity is constant so I have repeatable results.
If the room cools down you will notice your dev drop and you will need to compensate, if your room heats up same thing.
if the room temp does not fluctuate much over the evening session then you have nothing to worry about.
I will say that there are those here who work in slow methods, let prints dry and then evaluate..then go back later to print final.
If the room temp is not constant then this method of working can introduce a whole can of whoopass as there will be no repeatable starting points there for no established way of predicting results.
To the OP if you finish each negative in an efficient manner the room temp should not affect you whatsoever.