You sound a lot more focused than me.
Sometimes it's that picky perfectionist side. There are times where I'd spend a couple minutes just tweaking a layer's opacity by like... 10% just to see whether the difference is better or not. I get stuck on those minor details too easily.
Other times I'm just multi-tasking. Spend ten minutes working on a tag, walk around for five minutes, spend some time looking at tbt, etc.
It's a slow process with me at the helm, but then again if I finish it too quick, I always notice something off as soon as I upload it. Then I end up reuploading it about three more times. I'm a mess.
That Ayano sig I made for Lynn had about... 50 active layers, 80 total.