How's it doing now? (The FV that is, not the hydrometer sample ) I once had a lager take about 72hrs before or got going so probably just give it time.
If you're fermenting fairly cool, or at the the lower end of this strain's range then you'd expect it might be a little slow off the line. Even more so if you chilled down before pitching
Had a look this morning, a thin film of Krausen forming, phew! I'd forgotten how long it takes!