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... it's important to learn a sense of how long it's been "since then".

I do something similar, for a different reason.

I've noticed that some folks, when engaged in conversation, will glance at their watch. I take note of this, and a couple of minutes later, I ask them the time.

Invariably, they will look again. I get a secret chuckle from this.

However, if they happen to realize that I am doing this deliberately, they may seek to lie in wait to turn the tables on me, and ask me the time. I need to be ready for that.

Hence I have developed the habit of suppressing the urge to look at my watch. When I am asked the time, I try to do the mental calculation to arrive at a plausible answer.

"I believe it is about 8:12, but let me check to be sure."

Sometimes, I can be rather accurate, but more often, amusingly in error.