1200 – 1500 sq. ft. – 2 to 3+ hours
1500 – 2400 sq. ft. – 3 to 4+ hours
2400 – 3200 sq. ft. – 3 to 5+ hours
3200 – 3600 sq. ft. – 5 to 7+ hours
3600 – 4200 sq. ft. – 7 to 9+ hours