Quote Originally Posted by 21forme View Post
Canadian spelling?
From Cambridge English Dictionary

gruelling
adjective mainly UK (US usually grueling)
UK /??ru?.?.l??/ US /??ru?.?.l??/

extremely tiring and difficult, and demanding great effort and determination:
Junior doctors often have to work a gruelling 100-hour week.
He eventually won the match after five gruelling sets.

Further, Freightman endures a gruelling 3-4 hour work week.

Oh, past the half way mark.