"It is just a small task. I can do that in just..." Never ever ever say the above statement even if you are 10000% confident.

Friday after lunch got a bug report from something I did 2 weeks ago and my reply was exactly that, 2 hours after and I was still dealing with it

I have been working like two weeks in something that I was going to finish in one hour or two two weeks ago.

Ok.... you win

Task estimation max 3h.. if the damn thing was working properly in the first place!! Ofc I didn't know what I was getting into.. took me month+ to partially fix it (&understand a 1/4 of it) then when I got to deadend (js framework errors/bugs everywhere cuz of improper implementation from the start) had to spend another 2 weeks rewriting it from scratch.. FML! 😭😭😭😭 Almost ragequit after that fiasco..

I just double the time...