Even 45 minutes seems extended for gutting a deer.
I field dressed two deer last Tuesday in 15 - 20 minutes. With an hour one was hanging from my meat rack, the other was stretched out in the back of my truck to cool.
Admittedly, the butchering takes longer, but field dressing is pretty quick.
It takes me about 30 minutes from start to finish to field dress a deer, mostly because I'm still not real good with the pipes at the back end or with splitting the sternum. 15 minutes to set up / clean up since I keep my field dressing equipment and drag in my vehicle. The rest of the time was spent slogging through a quarter-mile of muddy field.