Fingers crossed, 40-50 jars. Sure that will take a whole day. You never know until you see them with your own eyes. I have sorted at least 25, 30 or more jars for a person more than once. But very seldom found much over a $1.00 marble, maybe a few $10.00 ones. But it only takes one jar or one marble to make it worth the effort. I sorted over a thousand for a man. He said I could have my choice. I did find three CAC marbles worth about $300.00-$400.00 each. I offered to buy one or all. He pulled those three out and told me that I could have any one of the others for free. I left as most times empty handed. He called me three years later with more marbles wanting me to sort them. I just never could find time to help him with those. When I sort marbles for people, about one person out of each 25 or 30 will give me a free marble or let me buy some. I have never attended any show the last 20+ years that I was not asked by people to identify from one to a thousand or more of their marbles. I have never identified every marble 100% correct. But I have seen a lot of marbles. More than I ever thought possible. Hopes this works out for you both. It is nice to tell someone that they have a higher dollar marble.