It's like shopping. You only come in for a gallon of milk, but you end up leaving 1hr later with $150 worth of groceries.
My daily routine in the game is usually going on collecting dragon souls, but as soon as I leave Riverwood, my little personal hub, I suddenly wanna go to a fort and clear it out. When I leave the fort, I resume heading in the direction of the nearest dragon lair, but then I end up wanting to irritate some giants at their camp(I don't fight them). When I'm done with that, its back to the direction I was originally going. At some point I'm going to be attacked by a random dragon(lmao ironic eh?) and then some bandits wanna make a temp cease fire and we kill the dragon. Then it turns into killing bandits and fast traveling to all thier known camps(that reminds me, I need to find my favorite camp.. Skyrim is so big, easy to forget where something is). Mind you, it's already noon my time when this going on. After wiping out the bandits, its time to transform into Buffy the Vampire Slayer and hoof it to Haemer's Shame and kill vampires, hey even go to the DB sanctuary where they love to spawn outside of and kill them there too! At some point I'm BACK to head the direction of said dragon lair, but wait what's this? DWEMER RUINS. WOO WHOO *enters* depending on the ruin, I might be in there for a good 30 minutes lmao. It is now the evening, and instead of going for that one dragon lair, I just say F it and fast travel to all of them, and then go to bed after they are all dead.
It is impossible to have a set schedule in this game lol.