Thx all for advices I also find this on the internet!
"An auto-flowering plant is “full size” at just 6-7 weeks from seed! For example, these autos are 6 weeks old, which means they won’t get any bigger even though buds are still fattening and harvest is several weeks away!
Auto-flowering cannabis plants at week 6 - a view from the side
So if you top your auto-flowering cannabis plant when it’s young and it gets shocked for 2 weeks, that means your plant only has 4 weeks in total to grow if you think about it. A small cannabis plant is going to yield a lot less, and a 4-week plant is a lot smaller than a 6-week plant. This reasoning is why many growers say to never to top your autos. You want a big plant instead of a small plant if possible. You need long colas to get the best yields from cannabis plants.
For a first-time grower of autos, it can be easy to stress the plant and stunt its growth for all kinds of regular reasons. Topping just throws another factor into the equation!
A stunted autoflower won’t produce much bud because it never gets big!"
Now will see how much she willing to give me on harvest! Maybe this is the reason for taking so long.