The number of jeans that you can wash will depend on the size of the jeans. If the jeans are men's size 36" waist, you should be able to wash 8 pairs. If the Jeans have a waist size of 28", you can likely wash up to 12 pairs. This is the maximum upper end of the loading spectrum. For various sizes, you can load as many jeans as will fit loosely packed in the washer and still see the back of the spin basket looking through the door when you are level with the top of the opening. The washer can normally be loaded to about 3/4 full with jeans (loosely packed). The canvas will get heavy when it is wet. For best washing results, I don't recommend loading it with more than 6 of the 36" size jeans or the equivalent of smaller sizes.
I hope that this information helps. If you need more assistance, reply with additional details.