An experienced player would say it would depend on the table texture, but I would hope they wouldn't raise earlier.

In my opinion, Hero was certainly in no position to raise after the flop, acting too early to consider it after the turn, and did it after the river when he was pretty damn sure he wasnt beat since another overcard didnt come out on the river. Also, since the river didnt pair with anything on the board.

I think they bet as soon as they should have.