We are flying to Phuket. Should I buy a return ticket on the date 30 or 45 days after entry?

[Vladimir]

We are flying to Phuket. Should I buy a return ticket on the date 30 or 45 days after entry?

[Kirill]

Flying to Thailand via Dubai, Omani airlines did not want to board the flight without a return ticket. Had to urgently buy a Thai-Vietnamese ticket for 45 days. Flew to Vietnam, vietjet also asked the return and moreover wrote down this information somewhere.