That turned out to be an accurate estimate; five weeks later, Moreland is back, according to a press release from the team:
The Texas Rangers announced this afternoon that the club has reinstated first baseman/outfielder Mitch Moreland from the 15-day disabled list. To make room for Moreland on the active roster, the club has optioned outfielder Leonys Martin to Triple-A Round Rock.
Moreland was having his best overall season in the major leagues when he went down, hitting .272/.326/.513 with 10 home runs and 25 RBI in 55 games. He went 5-for-19 in a five-game rehab assignment.
In Moreland’s absence the Rangers have primarily been using Michael Young at first base; presumably, Young will go back to the DH spot.