I had drafted my essays for Yale in 11pt font prior to reading that they require 12pt. Anyone have a perspective on how much wiggle room their "approximately" language provides? Feel free to comment or just respond to the poll below.
Example directions are: "The optional essay should be approximately one double-spaced page, formatted in a professional 12-point font,"

Good question and definitely a real challenge with no easy answers, but I'll take a stab - I work full time as a senior manager at a big tech company that can often be 50-60hrs and am also an officer in the Army Reserve in a leadership role (variable extra hours, but definitely some extra hours per week).
I would say the consistency is a key foundation, but two other tips:
Getting in the right head space makes the time more value-add so that you're getting more bang for your buck (it's not just about raw hours count). E.g. For me, I studied in the evening primarily, but coming from intense/taxing days, I needed to usually go for a run or lift before even trying to start studying or else my brain would feel like mush.
Going 3-4hrs every single day probably isn't realistic - your job will require some long hours, you'll need to study for an upcoming test, etc., so be charitable there when you can't, but also on the flipside, hunt for extra time when the opportunity appears. E.g. If I had a quiet day at work, I'd do a few logic games during lunch. For you, maybe after a test when you can back off the studying for a moment, try to ramp up studying if you can, etc.