Once the c02 is delivered to my babies during daylight hours, how long does it take for the plants to uptake and use the c02? I have to time my intake/exhaust fans to turn back on accordingly. Please help or comment if you know.

Guess nobody knows lol.

it depends on many many factors,
room size
plant size
plant numbers
ppm of co2 being injected
type of grow
type of light being used
temp of grow room
stage of growth
size of fans
and thats all i can think of off the top of my head

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fdd2blk she said she wanted 12 inches, so i gave her 4 three times.
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Okay, I know if you go over a certain PPM with the C02, the plants die. Too little C02 has minimal effect. How do I get an answer from all of the above when most of which will change all of the time? I will assume that as long as the PPM doesn't go above, the plants will be fine. My system vents C02 into the chamber 3 times a day for (x) amount of minutes. This is done by computer. However, my intake and exhaust fans are on a wall timer. I don't want to vent the C02 out too fast after it has been introduced. That would be wasted C02. How long do I wait until I vent?

Hmmmm. Maybe I don't vent at all because as long as the PPM doesn't reach harmful levels, all is well. I answerered my own question. lmao.

Except for the fact that if I don't turn on the intake and exhaust fans back on at some point, the vegging side will hit the 90's F. So, when is a good time to turn the intake/exhaust fans on again? LOL

I can now only assume that plants have a saturation point with C02. What is it? Ball park figure of course due to plant sizes I suppose.

ok in the simplest terms possible, and not seeing your system,,,, vent from the top of your room, and keep the ppms under 1600 to be on the safe side. (ive read that in late flower you can bump them up too 2000, but IMHO thats pushing it) if you pull air from the top of the room you wont pull very much co2 out. co2 is almost twice as heavy as oxigen. and if you run higher temps you can use more co2. and im sure you know you really need to have a meter handy to get it exact, but if you dont just watch what your plants tell you. start small and move up alil at a time untill they look unhappy then back it back down to a happy zone.
if money is not an issue you can get a computer controlled co2 injector that will keep you room at any given ppm.

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fdd2blk she said she wanted 12 inches, so i gave her 4 three times.
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Thanks for helping out. I'm searching for a fair priced injector. Later bro.