Although it goes against all one’s basic instincts, the idea that leaving a springer cocked for several hours seriously affects it power is something of a myth. For example, impartial tests on four well known commercial springs by Tom Gaylord showed that they lost only 3-7% of their strength after leaving fully cocked for one month.
https://www.pyramydair.com/blog/2006...g-last-part-2/
Of course, leaving a springer cocked unnecessarily is not something to be recommended purely on safety grounds, but I suppose for hunting it would be OK.