[Solved] How could I measure the total delay (time) to confirm the transaction?

Byo0ona Asks: How could I measure the total delay (time) to confirm the transaction?
First of all, I’m new to the Erthereum world, I need some help in measuring the total delay (time) require for confirming the transaction. I have a decentralized application over a Rinkeby network, and I want to know, how long the process will take until confirming the transaction?

I have been read in many papers that a total delay is 10 seconds, 15 seconds, 5.5 sec…etc My question:

How they measure these numbers “10 sec,15 sec..etc”? Is it manually, or there is a specific tool or way for measuring the total delay (time).

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