It's not that critical....and yes you are educated enough....

We already know that they will double - triple in size once in flower.... Once you feel like they are 1/3 the size you want them to finish....flip them to flower....

We aren't physically there so only you will be able to make the best determination as to when would be good....

Personally....I like my plants to have a total lifetime of 90 days max....30 days veg - 60 days flower....but that's just me....

CGI::::::