I try to have only one gun out at a time so I don't get distracted by other issues or guns. Currently I've got two that need attention. One is a hammer gun that needs attention on the right hammer, and it also needs to have some engraving restored. The other is a restocking job.
Both guns are usable, and I've been working on getting the hammergun taken care of, but something always seems to get in its way. So, it gets put on hold.
The longest I've waited for a job was for a restocking that took just under one year and four months. It was a long wait, but it was well worth it!