The minimum length of a VISION scan video needs to be 75 seconds. Two full rotations at the slowest Turn Table speed.
Please keep in mind ASCAND can use multiple passes (oversampling) of the video to improve the scan resolution once you are going beyond draft quality.
For Standard Quality LASER scans the best combo to get started is to take a 150 second video. Starting with the laser switched on. Switching the laser off for last 75 seconds will give you best standard results.
If you want to go for Detail you can record more spins to benefit from ASCANDs oversampling capabilities. 150 seconds with laser ON and the remaining 75 seconds with laser OFF will give you a good start.