It runs fine when it’s open but I was just wondering what’s the ideal system spec these days to comfortably run it 24/7?
Any Laptop could work as long as they meet the spec suitable to run Bitcoin core but most persons use a dedicated laptop - raspberry pi. Whereby the spec you mentioned is far greater to that of raspberry Pi 4 or 5 (64-bit).
Would the following be sufficient to flawlessly run Bitcoin Core on a new laptop:
128 GB RAM
2 TB SSD
16 Core
This system spec is more than enough to run your Bitcoin core 24/7.
If you are still having issues when you have this system spec, then try checking the performance level of the CPU. Sometimes high usage will slow the system down, maybe you are running other solidarity programs.