When it was originally announced that Danny Hultzen would miss time, the original time table was around two weeks, but according to Greg Johns of MLB.com, Hultzen will now miss at least one month of time. Hultzen won't even throw a baseball for two weeks, then will begin his rehab process, meaning that he could be out even longer if there are any setbacks.
This is obviously terrible news for the Mariners, even more so than most injuries, because Hultzen was likely in the Mariners' immediate plans for this season. The Mariners essentially have two reliable starters (Felix Hernandez and Hisashi Iwakuma) and a number of question marks making up their big league rotation. It wasn't going to be long before the M's turned to one of their stable of young arms this season, and Hultzen was the one closest to the majors.
Between this injury and Hultzen's control meltdown last season after his promotion to Triple-A, his timetable to the majors has been pushed back almost a full season. After dominating Double-A last year, Hultzen was moved up to the Pacific Coast League in late June with the thought that, assuming his success continued, he could make a late-season cameo in the majors and potentially be a rotation piece in the big leagues this season. Upon arriving in Tacoma, however, his control abandoned him and Hultzen walked almost a batter per inning over the next two months, facilitating the need for a return to Triple-A this season.
Even still, it was thought to be a few months of Triple-A to get his mechanics back in order, then a mid-season call-up to the majors for Hultzen to help usher in the beginning of a new wave of Mariners pitching talent. Now, with two weeks of no throwing followed by rehab then more time to get back on the mound in the minors, Hultzen is once again looking at a late-season call-up at best, essentially pushing his timetable back a full year from where it was thought to be a year ago.