Yes, you can add multiple videos to join them into one big and long file. This is a technique used very much nowadays. My advice is to use the database available on Software Informer to look for an application. If you want just the free ones, simply tick Free only next to the search bar. Download one of the programs, install, launch, add your files then save the output and that's it. Depending on your videos size and length the procedure takes from a few minutes to 1-2 hours.