(Note, this is not a duplicate of question because my question is based on constant running at a temperature. Just because another question has one point in common does not make it a duplicate question.)
I recently bought a Raspberry Pi for the very first time. It's a version 3, model B. Heat sinks came with the package, so I placed them on the CPU and the Ethernet Controller. I have the Pi in a protected place and lots of clearance for air flow. Only passive cooling was set up. I don't have any fans.
My purpose for buying this Pi was to run Pi-Hole 24-hours a day, 365 days a year. I've been checking in on the device a few times every day for the last two weeks and see that the Pi temperature is almost always 55.8 °C every single time.
I've asked around and have been told that 55.8 °C is fine and will not hurt the computer. Maybe I'm paranoid, but I wonder if this is the case when that is a consistent temperature and not a short-lived spike temperature. Maybe the device is still too new for any long-term use data to be collected. From my information scrounging, I see that all the temperature-related experiments have to do with stress tests and overclocking. I have not done either, nor do I have any interest in that topic.
My question is this: is there any evidence that 24-hour use of a Pi running at a consistent 55.8 °C will shorten its life span?