co2 and harvest time

ok so iam a new grower but educated on plants like especially our little friend...iam just curious...iam goin to be using a simple co2 system during the flower cycle...now heres the question.....the strain that iam using is 8mile high and it says 60-65 days....now i co2 will increase yield and growth if done right and i know about shutting down the co2 1 week before harvest...will the co2 affect the flowering time and if so what to look for or how to calculate this..please help

i run my co2 all the way through as im perpetual

CO2 doesn't effect the length of the flowering period .....and I also run all through flowering....for the same reason as above