30 hour layovers are driven by network schedule, revenue and sales, fleet utilization, etc. Crew costs are less important than crew utilization. The rig is pay no credit, so it won't really affect staffing. And get if they really care that much about not getting you the money, prepare to have the inbound flight arrive after 2330, so you duty out after midnight. Since its calander day, you'll get no pat even if its a 47hr layover.