To be clear:
I compressed my quilt and puffy into sacks, loaded them in the bottom of my pack.
Put my tarp in a stuff sack double checking that I have stakes. Put in pack.
Folded my pad In Half, placed in pack.
Stove and pot, placed in pack.
Went up stairs, rounded up some dental floss, melatonin, dehydrated meals, oatmeal, couple of Vias, snacks, pot brownies (its Colorado) ... put them in a stuff sack and placed them in the pack.
Optics, tripod, glassing pad, all put in their correct places.
Filled up a reservoir of water, loaded it in the pack
Checked my TP supply, loaded rain gear, baselayer bottoms, gloves, insulated hat etc in the pack.
Began cinching the pack down as tight as possible.... boom: 45 minutes have gone by.
What’s the deal?
You have a good list of tasks, so why not follow it and run splits on a stop watch? See where your time goes.
My guess is you have extra tasks that are unaccounted for and/or you get off track.
That "run up stairs" trip looks like a time pit. Get floss? Really, pack a roll at the start of the season. Sure you aren't having a cup of coffee while packing the Vias?
When packing optics, do you look through them to see if the glass is clear? "Oh look, I can see a cobweb on the ceiling way over there. Man this is good glass. Woah, that spider is going to eat that fly......."
I did a time-in-motion study on my girlfriend because I can pack to move out in the time it takes her to overnight pack.
"Babe, whattya doing?"
"Looking for my other chapstick."
"Don't you have chapstick in your bag already?"
"Yeah, but I need some now, my lips feel dry."
3 minutes, gone!
"Babe, why are you bringing those shoes?"
"I'm not."
"Why are you trying them on then?"
"I sorta forgot I had them and wanted to see how they fit. Aren't they cute?"
7 minutes, gone!
Obviously my reply is a bit tongue-in-cheek, but 45m is a blink of an eye when unaccounted for. At my job I billed in 6m increments so i started to appreciate task timing.
I also sort my task list, say packing, in an efficient order.....office closet, kitchen, bedroom, bathroom, hall closet, laundry room, garage. Never back-track, overlap, or forget stuff.