Is there a minimum stay requirement for retirement visa holders in Thailand?

Thanks for letting me join. This may be a stupid question but if I don’t ask it I’ll never know. I’m on a retirement visa and been living in Thailand for nearly three years. I return home to Australia twice to three times a year for about a week each time. I have a multiple entry stamp just in case I need to leave Thailand more than three times a year...it’s potentially cheaper that way. I’m seeking advice as to whether there is a minimum time I must stay in Thailand during my visas 12 month validity period. Put simply, I plan to spend six to nine months in Australia and the remainder of the year in Thailand. I’ll rent condo or something during my stay in Thailand. I think I’ll be okay, but I’d like any advice relating to problems or associated pit falls I may not be aware of. Thanks.