HC: I'll add....when I was working with copilots who wanted to improve but were finding it very difficult in the multi/IFR role, I advised them to resign (or take a leave) and pursue some good old fashioned bush/utility flying. In a JetBox or 350. They took with them a positive attitude toward self improvement and came back a year or two later with a huge improvement in SA, self confidence, and basic skills.
I still advocate this but there are very few takers, if any.
It is worth noting that there is a provision for copilots with Cougar to take just such a LOA, in the process of upgraded to captain, in their collective agreement.