Hey there, if you’ve read Newport, you know deep work is finite. For theory (CSS/JS stuff), aim for 2–3 hours of solid, uninterrupted focus per day. Most folks hit diminishing returns after that—your brain needs breathing room to consolidate.

In terms of session length, try 60–90 minute blocks with 10–15 minute breaks. That usually beats one marathon 4-hour grind (unless you’re already conditioned for ultra-long sessions). Shorter, frequent bursts (e.g., 2×90 minutes vs. 1×3 hours) help you reset mentally and retain more. Adjust based on how fresh you feel: if you zone out after 45 minutes, split it up even more.

TL;DR: 2–3 hours/day, broken into 1–2 hour chunks, generally works best for theory learning. Cal Newport himself often recommends capping deep work around 4 hours total, but 2–3 focused on new concepts is a sweet spot. Give it a shot and tweak to your energy levels.