That's the frustrating part about testing the lilies haha =p But I think I might just do that. I will set up a Accelerated mystcraft age, plant a farm in that, and one in the overworld ... and time how long it takes for them to grow in each world. With the Autonomous Activators, how would you set it up so that only one seed goes in each machine, instead of them all trying to stack randomly in various activators?
You could try separating out the activators. Have a block breaker linked to a single autonomous activator. Add a counter linked to a light sensor which while count down 7 minecraft days before the block breaker activates. Seed goes to the activator, pearls go to storage. Repeat the setup for as many seeds as you can find.
I think I'll try out this design later this weekend.