I replaced a broken dryer belt on my neighbors Danby Design dryer. I had never heard or worked on a Danby before. The belt was broken so I replaced it about a month ago. The new one broke last week. It is a very heavy belt for a dryer and I am surprised it snapped. They said it did have a heavy load in it when it broke. The belt goes around the drum, runs inside a v-shaped sprung idler, and around the drive pulley. The guys at work have no experience with this dryer. I can't find much info online about this problem. Does anybody have any suggestions for this situation?

check the pulleys very carefully to make sure they are all turning smoothly. if one is stuck it will wear out the belt very fast. also make sure the belt is not slipping off one of the pulleys during operation. check also for sharp surfaces that could damage the belt.
by the way, the dryer appears to be of a similar model to the Amana DCD330EB3WC. the belt that this dryer uses is a part number WE12X10009. is this like the belt you replaced?