We have an area longarm group that meets once a month and yesterday we discussed this exact subject. Suggestions included limiting the number of quilts you will accept per month, adding your own quilts to the longarm list (for example, after quilting 3 customer quilts, quilt 1 for yourself). For piecing time, I quit longarming everyday at 3:00 and sew for myself until 5:00 and it's time to start dinner. Limit the number of days per week you will work on customer's quilts. Don't accept custom jobs (this might be hard but they do take a lot more time.) Don't let the longarming overwhelm you as you will end up not taking any customers (this happened to two of our group). Hope this helps.