just done the FAA ATPL. Written exam on P135 was 82 questions. Oral exam is on regs and a/c systems (on the plane you are testing on). FLight test was maneouvers and a single engine ILS. All depends on your examiner.
The headache of the Visa, TSA clearance, fees etc is a bit of a nightmare. Especially getting the CAA in SA to verfiy your SA licence for the FAA. Make sure your instructor preps you well. do a mock test beforehand. good luck . .