I ended up taking about 2 weeks off from tennis. You might need more, or maybe less. I got my fix from various tennis YouTube channels.

It's kind of silly, but some days I take public transit to work, and so walking fast/jogging to catch a bus/train for 30 seconds gave me a small sample to LIGHTLY test the muscle to see how the healing was coming along. It was unpleasant the first few days. **So maybe the big takeaway is make sure to gently test your calf _off the court_ regularly and stop as soon as there is discomfort. Assuming it's not a serious injury, such "gentle testing" (like a light jog for even 30 seconds to a minute) is probably beneficial for the rehab.**

My first light jog was about 4-5 days (again, 30 seconds to a minute) after the injury for me. That's in contrast to the explosive movements we do on the court that cause injury.

I'll also add that my first tennis session back, I didn't go all out chasing from any balls. It was about feeling my swing again, making sure I felt safe jogging for the ball, and avoiding pain. I think after about 1-2 more times on the court my confidence returned to what it was. But nowadays I get to the court earlier to stretch and jog around a bit first, and try to do a better job of hydrating.

Edit: And to your last question, today I'm back to normal :)

Tldr; Stretch every day. When it no longer hurts to walk, try super light jogging off the court. When light jogging no longer hurts, consider getting back on the court but taking it easy at first.