i think you'll find they got back to him after exactly 15 working days. It's working days, not calendar days.
And they're now saying 30 working days.... just to keep you up to date
Okay, fair point with the 'working' days part, that never occurred to me. The 30 days part is news to me though, do you have a source? I can't find that anywhere on the site and the lady invigilating my stage 1 definitely said 15 (working) days.
EDIT: Grammar