What times for venting?

Im getting 2, 4" axial fans to vent my 6x6x3" space. One up high for exhaust and one down low for fresh air in.
The current running temp is about 80 degrees F/ 30 degrees C. My room is located at the top floor of our place, remembering living here last summer it got really hot mid summer so I'm estimating the room to climb to at least 36 C 86F when it really gets cooking.
I have 5 OG Kush babies in soil, running 2 2litre bottles CO2 fermentation, so it's distributing all the time.
What I'm wondering is when is the best time to vent the space?
I'm in my 1st week of veg, lighting schedule is 7am to 1am- on. 1:00am to 7:00. am off. 18-6.
I'm guessing I'm going to have both fans set up to a timer as they wont need to be on all the time.
Any help would be greatly appreciated.
 
Or do I even need to vent the space??
I've already cut my holes, and am going to go get the fans and hose, and can always return them if there is no need.
bored, day off, so I thought I'd get out and get them anyway. I'll wait to hear your responses before I install anything.
thanks!
 
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