What should I put for the duration of stay on my multiple entry visa application for Thailand?

In applying for a Multiple Entry visa to Thailand, it is common to list the duration of stay as either 60 days or 6 months, with some suggesting to mention plans for land travel to neighboring countries after the initial stay. For hotel reservations, it suffices to book just the first few nights. As for travel to Thailand with a one-way ticket, while it's possible to enter without a return flight, providing proof of onward travel is typically recommended. Travelers have managed with single flights and proper financial documentation, such as bank statements.