Sore calf muscle, how long do I have to sit around before I can go running again?

I felt my left calf muscle tighten up on a seven mile run the day before yesterday, now it's sore. It was near the end of my run so I slowed down, and took it easy for the last mile. Now it's tight and feels like it wants to cramp up much of the time. It doesn't really "hurt" and doesn't feel injured like a pulled muscle does, but somethings not right with it, a lot of tightness. I have a massager that I've been loosening it up with which helps a lot, and I haven't been stretching it at all. My question is, how long do I have to sit around with this before I can go running again, and am I risking serious injury if I do? What about cycling?

Sat. Jun 16, 6:36am

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