Thank you but how long does it usually take to fill the screen? And do you trim everything under the screen before or after you flip?
Unfortunately the time it takes to fill the screen is different for everyone based on strain, nutrient regime and environment.
Usually a 1mx1m screen with 4 plants will take a couple of weeks of veg before you need to think about flipping.
1 plant in the same screen will take 6-9 weeks of veg.
2 plants 4-6 weeks
But again it all depends on strain nutes and environment.
as for trimming, everything needs to be done by the stretch has finished, ideally, with just general maintenance after that of any strays etc.