That's a procedure turn approach or what is sometimes called a no delay approach?
The turn is at 30 degrees to the outbound leg into a left or right hand procedure turn to then commence a constant rate one turn onto the final approach intercept, NDB, VOR or ILS?
If that's what they wanted to have answered then in still air it's 60 seconds for a Category A aircraft from commencing the procedure turn to commencing the base turn onto finals. This gives a still air time of 45 seconds from the completion of the rate one procedure turn until the commencement of the base turn.
The answer or the confirmation of the above probably lies in the pages of Jeppesen, Air Traffic Control, Flight Procedures.
That type of question at an interview is not likely to relate to a visual circuit.