I would find it infuriating if I was expected to reply to every contact within 30 minutes. Sure, if it's important I'll reply. But otherwise? It feels control-freaky.
"Do you want me to buy X or Y beer?" "Do we have soccer tonight?" "Do I need to come home early?", "what were the days of our planned vacation?"
Almost all of those are non-important questions. Not an emergency. However, in each case, I'm blocked from further action (or risk angering her when I buy the wrong things, come home late). It's frustrating to be standing at the grocery store, give up after two minutes, and then get a text when you're in line that X >> Y.
This is, frankly, one reason I really prefer using Facebook Messenger -- it's easy to send a thumbs-up response if I don't feel like typing, and I can respond easily on my computer rather than having to pick up my phone.