The water in the line between your hot water heater and your shower will get cold. Once your hot water starts to move to your shower, it has to flush the cold out, so thats why is takes minutes to get hot water to your shower.
The only I mean only reasons why you might realize it takes shorter time to get hotter water to your shower are:
1) at a higher temperature, the water in the pipes will take longer to get cold, so if you use the bath or shower within a short period of time then you will experience hotter water sooner. But if wait over night, 150/130/120 degree water will take the same amount of time to get hot water to your destination faucet,
2) you have a recirculating pump
3) at the same time you changed your shower head or strainers to restrict the water less. I put new a new shower head that has much better flow and I cut down the wait time in half or more. Same for ach faucet flow restriction screens, I got 10x more pressure and quicker heat times after doing this
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