Mashrafee should take his time and use it to mentally and physically prepare himself for the long haul once he returns. No need to hurry! A month or two extra will do no damage in the long run. I hope he is doing some solid upper body exercises, and strengthening his shoulders (particularly his bowling shoulder). I am hoping he will come back a better, stronger and faster bowler, of course factoring in the time he will require to get into the groove of things.