Gigabyte Z490 Vision D (Thunderbolt 3) + i5-10400 + AMD RX 580

I am installing Monterey right now and hope the new OS will resolve the long boot time issue. I was on Samsung 970 EVO (the not plus version) , but I switched to the Western Digital SN550. The boot time fluctuate a lot on SN 550. Sometimes it takes less than 20 seconds to boot and sometimes takes around 90 seconds to boot. @manfriday Does your sidecar work? What config are you running on? Did enable internal graphics in the BIOS? Please let me know and thank you for sharing!
It was working yesterday when I checked it. And yes, my internal GPU is enabled
OK, I reinstalled Monterey on an Inland Premium 2TB NVME and then restored settings and files from my CCC backup disk via the Transfer Assistant.

Boot time is now 23 seconds vs close to two minutes on the Samsung 970 plus
If 4 or 5 reboots are all within 30 seconds then I think we can blame the Samsung. Do you know the firmware version on your 970 EVO Plus?
Maybe a hardware disk cloner ?
Has the disadvantage of needing a drive of equal or greater capacity though.
Clonezilla and maybe Acronis, and yes, for the most part (but not absolute) drive of equal or greater capacity. I use Clonezilla, boot from a USB and it works. Bought Acronis, but haven't tested it yet.
So, @CaseySJ, I think you'll like this analysis and recommendation:

if Apple continue to push this as hard as they are (no bootable backups), and you need a great spare/backup Mac, well then this is a great argument for a Hackintosh spare! It's obviously cheaper, easier to upgrade, alter in many ways and put into production. As long as Macs support x86, then this can be a viable option!

So, there, another argument for a Hackintosh....if you need a spare, well, here is one viable (and affordable) option!
Let's assume for a moment that bootable backups are no longer an option and we have (a) many third-party licensed applications, (b) many third-party licensed plug-ins, (c) lots of project files, data files, etc.

We know that:
  • macOS system files are installed in their own APFS sealed volume.
  • All of our applications, plug-ins, project files, data files, etc. are stored on the "data" volume.
We can:
  • Make full and incremental backups of the "data" volume freely.
    • Understandably, this is the 'stuff' that's most important to us.
In the event of a system crash or other major or minor disaster:
  • We can reformat the internal SSD and reinstall macOS from scratch.
  • We can then clone our backed-up "data" volume to the internal "data" volume that is located in the same volume group as the newly installed macOS.
    • Question 1: Is this viable?
    • Question 2: If not viable, then we can clone our backed-up data volume to a new APFS volume created on the internal SSD.
  • We can then go to System Preferences --> Users & Groups --> Advanced and point our home directory to the restored data volume.
So total recovery time would be:
  • Time to install macOS from scratch
  • Time to clone backup "data" volume to new internal data volume
Does anyone see a technical glitch in this scenario?
Clonezilla and maybe Acronis, and yes, for the most part (but not absolute) drive of equal or greater capacity. I use Clonezilla, boot from a USB and it works. Bought Acronis, but haven't tested it yet.
I mean a hardware based cloner not software.
Typically has two slots and you plug the source into one and the target into another, press a button and it makes an exact copy.
Just upgraded to Monterey, and am experiencing very long boot times (also have a Samsung 970 pro). I am using the latest opencore with z490 version D and 10900k.

Wondering if there are any known fixes/workarounds (like using Hfs+, or formating and reinstalling)?
Do you have a spare SATA SSD or a spare NVMe SSD that is not made by Samsung? If so, you could try cloning the internal SSD (that is running Monterey) to that drive and boot directly from that drive. Does it boot quickly?
I've just tried, nothing has changed. Sorry.
It may be necessary to report this issue to OpenIntelWireless group on GitHub -- but please check their Issues section to see if others are experiencing the same problem.

Meanwhile, we'll continue to see what we can do here.
I've just updated my Hackintosh to Monterey. 25 minutes and a few automatic reboots.

Smooth and easy process! :)

Z490 Vision D + i7 10700 + RX580 (OC 0.7.4)

Boot time: 1 min. aprox. (1 TB WD Black SN750 NVMe)
Awesome!! 100 points for WD Black!