+1 on the above, also what temp did you have it at? Lower temps will cause longer lag, and being a lager yeast I assume you had it at a lower temp.
I just did my first Oktoberfest last weekend (it's my first lager, too) and used the wyeast oktoberfest yeast (2633). I had it at 53° for over 48 hours before it showed any visible signs of fermentation.
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