Do people typically loose their head hair when treated with chemotherapy or radiation therapy, or both. how long is hair loss for?

Yes.: Any rapidly growing cells get the brunst from Chemo or radiation therapy. cancer cells are Rapidly growing celles too you know. They return after the therapy is completed.

Chemotherapy: Yes. However, you have previously stated that your tumor was not cancerous. Why would you need this kind of treatment. Chemo and XRT target cells with high replication and turnover such as malignant cells as well as hair. Once treatment is discontinued and body has recovered, there is regrowth of the hair but may be reduced in density and quality.