Bujumbura happens to be in Burundi..
All hrs count, however have some proof to back it up.
Some have been mentioned already;
-have instructors sign your flights, this is normal in the USA
-have the Chief Flight Instructor stamp and sign your logbook, "I certify that all the above entries from....to...... are correct etc.
- ask your school or FBO to send you an overall invoice that states all your hrs there, flight and ground.
This way nobody can ever argue whether it's all true or not.
Have fun..