Another way to see if noodles are done soaking is to check the texture. They should be soft enough to eat, but still firm (firmer than "al dente"). Remember: the noodles still have to be fried, so don't over-soak them, or they will turn out "mushy" instead of chewy.
I find about 20 minutes of soaking time is enough. Drain and run through with cold water to keep them from sticking. Reserve.

