The high res version may be of a different mastering so if you want to check if you can hear any difference you need to make sure both is from the same master to compare.

TVs can mess with the sound a lot so this is a hit or miss option

It doesnt take that long and usually drivers have been used and tested before being sold in a speaker. 5-10 minutes was enough for my dads new speakers to go from horrible to normal so those have probably never even been tested. Speaker designers know parameters change over time so they always design with and test new designs with “burned in” drivers. (Probably not hundreds of hours but a few at least)

But no if you dont like a speaker after a few minutes or an hour you probably never will.

The only time i have heard a very clear and obvious change on a new speaker was around 20 years ago when my dad bought a pair of Audiovector m3 speakers. We connected them and started playing, it sounded horrible, his jaw dropped and he looked really confused. I had heard some speakers need some time to play in. My own system usually sounded a little better after having warmed up for a song or 2 so i told him we should just leave the room for 5 minutes and then come back and hear if there was something wrong with them or they just have to loosen up a bit. 5-10 minutes later we came back and the sound was fine and he got a big smile on his face. I didnt listen enough to music on his setup over time to know if it changed much after the first few minutes but it really was a night and day change.

Coax to dac