Immediately.

As Peter watched, his father was again standing before him (well, except that he was leaning on the bar).

"Glad to see ya, Dad!" he said honestly.

"Not as much as I am!" came the response.

Be that as it may, Peter couldn't help but notice that his father didn't LOOK happy. He decided to check on that.

"Then why doesn't it look like you are?!" he asked.

"Well," his father honestly answered. "When the change first happened, I didn't know what I was going to do with myself. But when it reversed, I had just come up with a few things."