I'm considering trying the planet ito method the exact times alude me now and stupidly I didnt bookmark the page, but its along these lines, you still give them 12 hours dark during flower, as its the dark periods that count not the light, but giving them longer light periods, so, say 18/12 so over 4 dark periods(days in the flowers life) they are getting 6 hours more light, you only do this over I think its 2 weeks during full flower and revert back to normal for the last couple of weeks but dont quote me on that.
The science behind it makes total sense as over a period of 7 days, the plant thinks its only had 5, of course this extends your run by maybe 4 days, but the benefits in yield are supposed to be worth it, its just chasing the timer all the time to adjust it would do my tits in haha