Most of the yard is out on jobs of a month or more, and the daily rate on this site is the wrong price for that. Seven days and twenty eight days both drop the rate automatically, and anything longer is quoted.
A machine kept on an island for a whole build is serviced there, on a schedule in the contract, by our own mechanic travelling out. That schedule is on the quotation too.
Long hires are invoiced monthly with GST, against a purchase order if your project needs one. Contractors we work with regularly pay on thirty days and send nothing up front.