@MusicalBox beat me to most of this… Create a timer of your font/color/size preference.
My approach is a bit different though.
No need for multiple tracks for the timer video.
Timer project
- Determine length of clip to be sped up.
- Set Video Mode to exact FPS of the source clip to be sped up.
- V1: Transparent clip set to exact length of clip to be sped up.
- Export, select VP9 (with alpha channel) [Creates a transparent video clip]
Main Project
- V1: Source clip
- V2: Timer clip
- Adjust both clips at the same speed.
1.0x Speed - 2 second mark of actual video
2.5x Speed - 2 second mark of actual video