“Outlander,” the hit Starz series adapted from Diana Gabaldon’s best-selling, genre-bending novels, returned to television on Sunday, Mar. 6 with a super-sized premiere. Clocking in at 80 minutes, it might feel just a wee bit long to even the most dedicated fans. But episodes can be too long for very different reasons, and “Echoes,” the show’s gripping sixth-season premiere, slightly overstays its welcome for all the best ones. Here's TV critic Allison Shoemaker's review.