As an "all in one" fertilizer APT in our opinion is one of the best. It does give very good results. It's quite easy and convenient to use. Also they have a very well documented website which gives an understanding of the importance on research given in their product development process
8 hours. See BPS is not a right measure as it needs to be changed depending on plant growth. Best part will be to install a Drop Checker and see if adequate CO2 levels are maintained