What is the difference between travel booking confirmation and flight confirmation for a Non-O eVisa application in Thailand?

@Ralph ************

with multiple entry tourist visa you'll get 60 days every time you enter Thailand during the validity of the visa. You can also apply for a 30 day extension each time you enter.

Whether they'll be willing to sell you a re-entry permit is up to you and the immigration officer. It's very rare to get a re-entry permit for a tourist visa because it's almost never worth it.

You can ask them not to use your visa but it's their decision on whether or not to do so. A few reports of people not giving the tourist e-visa printout to the officer when entering in hopes of saving it for the future but the officer seeing it in the computer and forcing them to use it.

@Ralph ************

1200 yes. But you can't do it before checking in for your flight as the re-entry desk is after security but before passport control