I charge 3 x's the materials. Fabric, backing , batting and threads to piece and the quilting. Plus gas, shopping time and washing and ironing the fabrics. And + minm $10 per hour. Then it also depends on the piecing.
Some tops can be made in a day or two but the quilting may take 3 or 4 days. So just depends. And I never start till half is paid.
ConnieF