We call this waiting period 'watching' because we watch Bo for a re-alert. If Bo re-alerts within 10-15 minutes and Austin's blood sugar is in Bo's reward range, we consider the alert valid and reward Bo. If after 15 mins it's still outside his reward range, we consider it a false alert and we put Bo on his place.
Tonight at 7:15 pm, Bo alerted 12 minutes after Austin gave himself a post meal bolus. (This means he gave insulin after he finished eating rather than before he started eating.) We checked and Austin's blood sugar was 136; he had 8 units of insulin on board that was working on the 120 grams of carbs he had just consumed. I told Bo we would 'watch' and put him on place to the left of Austin. (As seen in the above photo.)
After just 8 minutes Bo got broke place and re-alerted to me. Again, I told him we were going to watch and put him back on place. At 7:30 pm, exactly 15 minutes from his original alert to the 136, Bo re-alerted. When we checked, Austin's blood sugar was 209. (This number is within his high reward range of 173-220, so Bo got rewarded for the alert. The pup was ahead of the meter.)
I captured the re-alert in the video below. You see Bo break place to come and alert. He also barks when I ask, 'what is he?' It's important to note barking is not part of his alert chain and is not a desired behavior.