Hey there Ed... Sorry I've been out of pocket the last few days... they've been pretty crazy.
So I absolutely don't think that waiting a couple hours to respond to a text is a bad thing at all. Yes, it's a little game, but there's nothing wrong with getting good at playing it.
Chatterbug has a 24 hour rule which I follow almost all the time. Meaning you wait a full 24 hours before responding to any text/email whatever, so long as it's not critical that she gets the information before that.
And that rule obviously doesn't apply to critical conversations about the kids...