I'm not certain my experience is relavant since I had XRT and no chemo, but I will reply and remember everone is different. I survied 9 radiation treatments working full time and then 'went down for the count due to thrush'. I was running high fever and could not get warm. Hit the bed for 6 weeks(not a good idea, take a walk around the block). Went back to work 3 weeks after treatment ended but far too soon and did not have to talk, used email instead. 5 to 6 weeks would have been better return time. I never got my voice back after rad to the point I could talk on phone for any length of time, although may people do.

If your company is making you make a 'game plan', I'd give myself the longest time you can possibly get away with after treatment and surprise them by coming back early.

Take care,
Eileen