Propane capacity is a limiting factor, so few balloons can fly for more than 2 or 3 hours. Flight distances are generally on the order of 3 to 12 miles. Balloons must be inspected for airworthiness every year or every 100 hours of flight time. Many factors impact the life of a balloon, including type of fabric, maintenance and conditions under which it is flown. Generally, balloons with more than 500 hours are considered old, but may still be airworthy if properly maintained.
Used balloons are occasionally available.
Solar balloons are currently under development. Balloons are usually from 50' to 80' tall.