Rental periods usually are set in hourly, daily, weekly, or monthly increments. Rental businesses make money on renting out their equipment, so unless there are future contractual obligations for a piece of equipment, they will rent it to you for as long as you need it. There are minimum time increments for rentals, particularly for heavy equipment. Every vendor sets their own terms, rates and restrictions, so be prepared for some variables from each one. Pick-up and delivery of equipment can also be a time and cost factor.