Okay -- I think you're using terms that mean something entirely different than usual on this forum.
Creating a recovery disk is the process where Reflect can create a CD, flash drive, or ISO file that will reboot this system with a minimal OS (WinRE or WinPE) with Reflect embedded in it, so it can be used to boot the system and when you can't boot the system drive and restore it from an image backup.
Your reported 15 minutes is a bit long, but not excessive
Then you said
On my wife's Windows 11 laptop, using the same type of SD, the Windows 11 system took 3 hours to create a Recovery drive.
I took this to mean you were trying to create the same kind of Rescue Media flash drive.
But I now think you're referring to creating a backup drive or what we call a CLONED drive. Is that what you are doing in both cases? What software is being used for both? Please be very explicit. And spell out what YOU mean by a "Recovery Disk" and a "Recovery Drive". Edited to add: I see that @jphughan replied while I was formulating my reply, but I think you can see that we both were confused by your original post.
L.W. (Dan) Danz, Overland Park KS
Reflect v8.1.7784+ on Windows 11 Home 23H2 22631.2792+
Reflect v8.1.7784+ on Windows 10 Pro 22H2 19045.3693+
Reflect v8.1.7638+ on Windows 10 Home 22H2 19045.3693+