Looking at today, I'm seeing 13 checks per hour. So about every 4.5 minutes.
My battery is at 77% with 9h15m standby / 1h36m usage. Just looking at those figures for the fun of it.
Reality is that for the five days I've owned the watch the battery lasts from when I get up in the morning to when I go to bed at night. Just like my S5 did.