learn yourself.. but i use 20/4 vege and of course 12/12....
but i dont have no hurry... i just love to watch they grow and keep garden good looking and take a taste trimmings.. like growinmg BONZAI !!
and beside every strain not grow sametime or same fast...
my cycle take time 3-5month... sometimes 3 some times 4month and so on... and it depends on strains and what yu want and how fast or how u du it or what yu do it...
if yu like to grow monsters or dwarfs or yu want to do it medium... or instant flowering after 2weeks... and yu have to think what kind of harvest yu want to get
and if yu like to grow sativa.. so vege is short but flowering is little bit longer or indica.. its otherway... . yu choose your game rules...
happy growing DUDE.