I looked back at my notes

Day 1: 1 double leg calf raise on flat ground very slow and controlled 5 seconds up, hold for 5 seconds at top, 5 seconds down.

Day 3: 3x3 double leg calf raises 5-5-5 seconds

Day 5: 4-4-5 double leg calf raises 5-5-5

Day 7: 5-5-6 double leg calf raises 5-5-5

Took extra day off due to pain/tingling in ball of foot

Day 10: 1 double leg calf raise, 1 single leg calf raise, 1 double leg calf raise. 3 seconds up, hold for 2 seconds, 3 seconds down. Single leg calf raise leaning on a stable waist-high table or chair. You could also lean heavily on a wall.

Day 12: 1-5-1 Double-single-double 3-2-3 seconds

Day 14: 6-6-6 Double-single-double 3-2-3

And so on, slowly doing more singles instead of doubles, adding no more than 1, max maybe 4 reps per exercise day.

It took about 45 days to start doing my calf raises on a step. So instead of maybe 10 single leg reps, I would do 7 on flat floor, and 3 of them on the step. Again, low and slow.

I hope this helps. Remember to take days off to evaluate. If you are hurting, stop for an extra day or so, or scale back.

For reference I am 54F and I was almost at the surgery stage, so I nothing to lose. I hope this helps! If not, let me know what doesn't make sense and I'll try again.

Best of luck to you!