I am sure you can go 45 minutes and get a perfectly good oil. In the culinary world, you can definitely infuse a lot of flavor into oil with a crushed clove of garlic in about three minutes. So I have to think you get quite a bit of transfer from ABV in coconut oil in just a few minutes. And there are probably diminishing benefits as you increase the time.
But going longer will give you the maximum extraction assuming the temp is not too high. As with cooking, if this were fresh, free, tasty bud instead of ABV then maybe I could see doing something quick to preserve flavor at the expense of strength, and it would probably be great. Ive seen people making butter say to never squeeze-strain it because it gives off harsh flavors. But for ABV there's really no downside to cooking for the maximum amount of time....provided the heat is low enough so you dont degrade the THC. I will do 8 hours or even overnight at 180-190F. I probably wouldnt want to cook it that long at 230F, though. And by all means, squeeze out every last drop of that oil when its done. Especially with capsules, with ABV I think you are going for the maximum extraction / concentration. If its too strong you can use smaller (more) capsules or dilute it with something tasty.
I also think there is a benefit of doing a second decarb... there was a recent study where they looked at ABV after it had been vaped 30x, and 1/3 of the THC left was still in THCA form.