An interesting exercise, so I went back and looked at my records...
When I candle my seeds, often when they are put on my warm light board (a toy tracer) static electricity builds. I use to ever so lightly mist with water to calm them down. I did this with a Mrs. R. O. Backhouse martagon cross, and I apparently got a seed too wet and didn't let it dry sufficiently before I put them back into the little 2x3" ziplock plastic bag. When I removed them 2-3 days later to plant, that one had already started germinating. (But probably not as far along as you observed, Tracey.)
My longest would be those lilies that normally are quick germinators (epigeal) but waited until the second season (after a winter) to germinate. The first in this list is the longest overall, too:
Lilium philadelphicum - from four seeds: one germinated in 137 days
------------------------- two germinated on one year and 37 days (402 days)
Lilium mackliniae - From seven seeds: one germinated in 43 days
---------------------------four germinated in one year and 28 days (393 days)
Lilium maculatum cross - 298 days
Lilium leichtlinii collect in Japan - from 10 seeds: one germinated in 43 days
--------------------------seven germinated in one year 29 days (394 days)
Makes me out to be a very patient man, doesn't it...