Speaking directly to recruiters at Sigmar and Silverwings... they confirmed to me that NO SALARY during training. Only per-diem at a rage of $60.00 US per day. Only after and when your final line check has been completed, you will go on full pay.
Bear in mind, it's in the interest in the company to stretch the line training portion to the max as essentially there will be two pilots up front, with only one being paid.
I can't speak for the 757757 or 777, but the 737 program has been taking as long at 3 plus months of which there is a very extensive line training program, again for the reasons previously mentioned.
Perhaps if prospective pilots would exercise self-control, turn down job offers, refuse employment on such atrocious terms and conditions, and then and only then, voice their opinions to the contractors, Ethiopian could be convinced to pony up the $$$$ during training.
It time that pilots be part of the solution rather than part of the problem as far as the "BAR" is concerned.