That's just hunting for you. Sometimes it happens on the last day, sometimes not at all and sometimes in 45 minutes. With hunting you just never know when opportunity is going to come. Congrats on a nice bull.
Every once in a while it works out that way...and then I feel guilty about it! Until I remember all the scouting, time, effort, trail cam photos, range practice, long cold mornings in the stand, etc. and don't feel so bad at all!