The initial estimate has Boxberger missing eight weeks, which would mean the last 2+ weeks of spring training and the first 5-6 weeks of the regular season. If that timetable holds, Boxberger won’t be back to the Rays until at least the middle of May and he would miss about 35 games. But there are also reasons to think Boxberger could be out much longer.
First of all, this is the Rays. They always err on the side of caution, especially with pitchers. There is also this little nugget from Rooney:
Cash said the team will have a better understanding of when Boxberger should return four weeks into his rehab.