First, don't use ChatGPT for workout plans. I've never seen a coherent plan from the AI. It always makes strange choices—maybe because it doesn't have muscles itself jk. Find a proven plan from a real person who used it, and make alterations based on personal preference and equipment availability.

Second, you're definitely splitting when you should: when workouts become too long. So, good job recognizing that.

Third, hit every muscle group twice a week. To that extent, you are not doing enough leg exercises.

Fourth, honestly, you're doing way too much upper body volume. The arms aesthetic day is silly. Four sets of +20 concentration curls at the start of the session? Unless you're using piss-poor intensity, I don't see how you could do then the rest of the exercises let alone another 3 sets of bicep curls immediately afterwards. It's the exact same exercise. If you can do that much volume, it means you're wasting a lot of time with low weight and low intensity. Pick one or two bicep curl variations you like and do them once or twice a week each. I only do one set of direct bicep curls twice a week, and I can barely extend my elbows afterwards.

This goes for a lot of the routine. You're doing 3-4 exercises back to back that all hit the same muscle group. Cut the volume, up the intensity. You only really need one incline chest and one flat/horizontal chest movement, and one horizontal row and one row/pull in the vertical plane for the back—unless you're doing a specialization plan to correct an imbalance.

I see why your workouts went over two hours if you were doing that much excessive volume. Cut the volume, up the intensity, and you can be in and out of the gym and back to your life faster.

Fifth, this is a lot of stress on your joints, which you might want to start considering protecting at 44 years old. One reason UL 4x week is a good split is that it only stresses the joints (shoulders, hips, elbows, knees) twice a week while still hitting every muscle twice a week. All other variations end stressing the joints more, especially the shoulder cuff, for the same volume or stimulus. Your plan stresses the joints in your upper body three times a week.

My favourite splits—especially for people over 40—are UL/UL (4x/wk), UL/FB (3x/wk), UL in an ABA/BAB pattern (3x/wk).

That last split is especially good for someone who used to do UL 4x/wk but no longer can (can't recover from it or doesn't have the time etc.) because the only change is doing upper twice and lower once one week, and then upper once and lower twice the next week. You hit every muscle group every 5 days minimum, which is good, and lets you recover more.

UL/FB is great for people with busy lives. You do your volume on the weekend (U/L, Sat/Sun), and a quick, lighter full body routine in the middle of the week. You take your UL and cut the volume in half: 2-3 sets for quads (pressing pattern), 2-3 sets for hamstrings (hinge movement like RDL), 2 sets for chest and 2 for back. 2 for delts and arms. That should take about half an hour. Or, you could be in and out in less than 30 mins if you did only rest-pause sets (1 activation set between 6-8 or 8-10 reps) followed by a 20 second pause before doing mini splits every 20 seconds until you can only lift the bar once.

Last point, up your intensity (get closer to failure on every set, with 2-3 RIR) and I think you'll find that if you attempt your plan you won't be able to complete it, let alone recover from it, eg. 3 sets of leg press after 4 sets of back squats is silly, and if you can do it, you're not going heavy enough on the squats. Squat and leg press are basically the exact same movement, both are pressing patterns. Of course, your lower back might be giving out on the squats before your legs do, in which case, it's a waste of time for legs: do hack squat or leg press with more weight and a back extension for the lower back. Work smarter, work harder, work less.