Self-service laundromats rent machines by the load; wash & fold services take dirty laundry by the pound and return it clean and folded; pickup and delivery adds logistics on top of either model; dry cleaning uses solvent rather than water for garments that cannot be washed.
Turnaround for wash & fold commonly runs 24 to 48 hours, and pricing is usually per pound with a minimum order. These are industry-wide patterns rather than the policy of any particular company, and they apply to lavender-branded shops exactly as they do to any other.