Takes between two and five seconds depending
And with a smart watch it takes less. With a notification that appears only on my phone and not my watch that goes to zero depending on context, because it means something I can look at much later.
It also can be a matter of minutes difference between walking and driving somewhere, but people still drive, take taxis, buses, etc.
if notifications are the thing you care about, I would think the pebble has you covered there.
1) There is no filter, the pebble gets all notifications. That is useful but not AS useful - as I said I really like the layer of notification processing, so only really important notifications reach the watch.
On Android that is different and they allow you to choose what notifications go through.
2) The Pebble screen is not very readable at all in a lot of indoor areas, so even with it being quicker to see actually being able to read it takes longer than it takes to pull out a phone.
But notifications are just one small aspect of the many small things that makes a smart watch useful overall, so to focus on problems with any one aspect doesn't help you understand anything much. It's like you are saying that because the elephants toenail is untidy, it can never carry much weight...
I think these things are toys and I don't take them seriously.
Your loss. I think of them as tools and use them in ways that improves my life. Dismissing newer technology as toys is one way to get easily blindsided by wide acceptance and implications thereof.