Autoflower on Hydro. How fast will it be

Almost harvest time :) Watermelons in front are looking great, the ones in the back are just a bit slower. Curious about the total harvest because it looks a lot less then normally (but I have to keep in mind that it's only 300W). 18-08-2021: Still getting bigger. No big buds at all but definitely a lot of them. Right now on an EC of 0.8 for a day or 3-4. Than harvest time (probably this weekend). Need the lamp for my comparison round so she must hurry up. Trimming will be tough I guess, a lt of leaves in the buds. 19-08-2021: This is going to be a prayer without end. So I planned to start harvesting from today. However, it seems as if they have decided to make some buds after all. Lots of white slopes and here and there completely clear peaks. I'll leave them for a few more days anyway. I'm really curious about how much will come out. I think I'll be able to hit the 400 dry soon. It contains beautiful weed, but also pieces that I think ... well that goes directly with the clipping waste. This is very special.