Connect Numerous Audios Together Into One MP3

This is a very simple task. I will pay $10 for it to be done. The task is to connect 40-60 different audios together into a file that I can download. The audios are on my dropbox and once I've assigned the task, I will give the freelancer permission to access the dropbox. The audios are already in order, you simply need to merge them into one mp3. There is no video involved in this task. They are just audios that need connecting It is roughly 60 audios at 8 minutes each file. I need this project done ASAP.