Limited timeline editing

the blender gives me 10s to edit the video on parrot os Linux please help

What you need to do is increase the “end frame” in timeline or output properties tab > end frame.

And seconds are relative to your frame-rate. In first image you can see endframe is 250 so i’ll get 250 frames in vse also. and my frame rate is 25 fps so 250/25=10s in vse. In second image is i changed end frame to 500 so now 500/25=20s or 500 frames in vse.