Less than 1 week –
Less than 10 hrs/week –
I have roughly 500 videos. They are MP4 format and all the videos do not have moving pictures but just 1 picture and an audio. The length of each video varies from 2 minutes to 8 hours
All you have to do is remove the image on each video and replace it with the one I provide you (same image for all videos so a very easy task)
You could use windows movie maker or whichever software you want ...