Extra Darkness Before Flowering?

So I've been growing my 1st lowryder now at day 26 and looking into other lowryder grows determining sex never takes this long so I assume this is a lowryder cross (it is still very small showing LR characteristics). And my friend used one of these seeds first and his was sexed at day 29 doing 12/12 all the way through.

I'm on a 20/4 light cycle and because I only have one grow area and other seedlings growing in there as well I wanted to try force flower my lowryder without switching to a 12/12 light schedule and I read up on some people letting their plants have a 24 hour dark period before switching to 12/12 anyway and they say it works so I wanted to give it a try.

In total I will have gave him/her 28 hours of darkness after I put him/her back in my cabinet tonight when the lights come back on. Now I've kind of had second thoughts of what I've done, could my plant be stressed or harmed now that I've gone through with this? My plans are 20/4 all the way through.

microkrunk, i am on my second lowryder2 grow and have had great success with leaving lights on 24 hours during entire grow. Started seedlings under cfls and after about 1 week moved into grow cabinet under 400w hps and have had amazing results. Mostly using these plants for bubblehash and green dragon. They are prolific seed producers, and since seeds are a little $$$$$$. You must pollinate. This is just my humble stoner opinion. Remember these are an autoflower strain which means there is no vegetative stage. Dont be fooled!!! They will flower regardless of light regamine.