Take automatically in intervals shots of multiple screens, with Auto Screen Capture
Auto Screen Capture is a free, easy and portable application that will let you capture a single or even four screens at once, in intervals you can define.
The program is rather simple and not very attractive, but it will do the job any time. Just configure how many screenshots you need and in what intervals.
Auto Screen Capture supports jpg, bmp, gif, tiff, png and wmf formats.
A serious drawback is that Auto Screen Capture uses its own directory to store the screenshots and although it won’t allow a change of this location, it will open it easily to let you browse and copy or cut the images.
If you are going to use Auto Screen Capture a lot, you may like to have a utility like Download Mover to have these screenshots moved automatically to an alternative folder.