Mega backdoor Roth問題請教

想Mega Backdoor Roth, 但不能in plan convert,也不能direct rollover. Does 60 days per year rule apply to mega backdoor Roth? 公司必須給我寄支票, 我去存Roth, 算indirect rollover. 但 IRS has 60 days roll over rule once in 12 months. 我一年隻能轉一次嗎?(withdraw after 401K->Roth) 謝謝!