Lager Newbie. What is typical lag time for a lager?

[Fremont Brewer]

Hello all.

I've just brewed up my first-ever attempt at a lager. I made Jamil's Dopplebock recipe. I pitched @ 45F with 6 vials of German Bock Lager yeast. My question is when should I expect some airlock activity? When should I get worried? How long do lager ferments usually take?

Thanks,

Fremont Brewer