For the conversion to Kenyan license from Tz, you have to sit an airlaw exams, all your ratings on your Tz/Ug license will be transferred to your kenyan license.
Converting to Tz license involves sitting for a composite/conversion paper, and writing a TTR for the aircraft you need to be endorsed on your license, and a flight check. All should take between two weeks and a month, or even less depending on luck and your input.
Hope that helps for now.