Which is exactly why every grower worth his salt uses a timer and every single grow guide talks about timers. Why would you go out of your way to complicate life just for the sake of $5?
But as above, it can be strain dependant, but you should be ok.
Good to hear. But this sounds like a typical case of someone growing before theyve done their homework, a typical recipe for failure. A timer is typically one of the first things people buy before they even take delivery of their first seed.
Humans are not reliable 100% of the time; there are always potential mitigating circumstances. Get a timer. Even good, easy-to-use digital ones are less than $25. Manual ones can be bought for $3 to $5.