Howard took roughly 15 days to wake up and 5 days to feel somewhat back to normal. At least, normal enough to walk and somewhat jog in place.
Jenny had personally studied the changes in his blood, and had to make an adjustment to the previous tonic she was using in order to deal with the strange changes that had arisen in Howard's body. Whereas before, she would only see a single Ki Cell at most underneath the microscope, there now seemed to be hundreds. This was because in addition to Howard's normal Ki Cells, there was his normal human biology. Yet at this moment, he seemed to have changed completely from a human to something else.
It was almost as if he ascended to a higher form, yet he was still the same Howard no matter how she observed him. Doing a simple warmup, Howard smiled and jumped up and down while Oclen charged into Harkel's Ghost Domain.
He made it 50 steps before he even slightly slowed down.