Is there a sizing recommendation for WC Disk? Based on concurrent user count, weekly/daily reboot schedules

I make mine 1:1 with the c: drive for multi-user. And like 50%-100% the size of the c: for single user.

This can depend on several factors - are you using RAM cache with overflow? Is it large enough not to spill over to disk/very little overflow? Rate of change? Are you doing both daily and weekly reboots? Single vs multi user? How large is your page file? If space isn’t an issue then aim higher to be safe. Definitely look at multi user being larger. Single user doesn’t need to be as large depending on factors. Are you able to test and check?