Several variables here. If I hand piece a top, about a year. By machine the top can take several months. Handquilting takes me three months for a queen. Now the mitigating circumstance is the two preschoolers which means I can only work about one hour a day.
Pre Kids, I could machine piece and hand quilt a queen sized in 6 weeks flat, a baby in a week. That was going full time hours (40 week).