Proviron 25x2 or 50x1 daily?

First post, be gentle. I love Proviron as an add on to Test E. But I’m on the fence as to the proper schedule. Should I take 25mg x2 or 50mg x1, daily? 60 year old male looking to hold on to the lean mass I currently have. Much thanks in advance!!

Once daily is fine. Half life is 12-13 hours.