I think you are doing it right, and two hours a day sounds very reasonable. I started back at work doing 4 hours a day, and it was VERY rough starting out. I had constant dizziness, disorientation, difficulty reading, and a hard time dealing with stress, in addition to almost fainting at a few meetings, but after a couple weeks I felt myself getting better slowly but surely. I am still up and down and have my struggles, but I look back every few weeks and realize I can do a little more than I could the weeks before even though it feels like I haven't made progress. Hope this helps.