Phonak Trial devices / demonstration instruments - maximum trial period

[Zebras]

Phonak Marvel Trial Aids

I managed to get a pair of Marvel trial aids at an awesome price. BUT I think they will beep hourly after 6 weeks and I will need to reset / reprogram them. Does anyone know how the trial period works, there is no option in Target to stop this, but there is to change the function level. Currently running them as M90; once tuned in I might try them at M70 / M50 to see what the difference is actually like ! Drew.