You COULD just check your journal for his schedule.
Okay, let's take a look at Quill-Weave's schedule.
You are a player and you have to speak to Quill-Weave to finish a quest. You look in your journal and it tells you that Quill-Weave can be found inside her house, except for twice a day when she leaves her house. If you do not find her in her house you might look over at The Count's Arms. If you do not find her in The Count's Arms you might find her in Lelles' Quality Merchandise. If you do not find her in Lelles' Quality Merchandise you might find her in Anvil Castle. If you not find her in Anvil Castle you might find her in the Imperial City. If you do not find her in the Imperial City you might find her in Chorrol. She'll be following Casta Scribonia around Chorrol while she's there, so look for Casta Scribonia. Some of the places Casta Scribonia might be found are the Mages Guild and the The Oak and Crosier. If you can't locate Quill-Weave in Chorrol with Casta Scribonia she may have returned to Anvil.
It gets worse: some of this behavior is unpredictable. She doesn't always go to the Imperial City. Sometimes she stays in Chorrol for a week, sometimes for a day. Journal directions cannot tell you when she will be traveling or where she will be at the moment you need her.
What happens if, while following Agarmir, something in real life distracts you for a few seconds? When you turn back to the monitor Agarmir is gone. How do you find him now? Your journal won't tell you.
Given the advances in technology, I think we can expect that AI behavior in Skyrim will be even more complex than Quill-Weave's behavior. So no, I don't think a journal entry is going to work in Skyrim.