Hmmm i think aplying Cumulative Update KB5062557, which includes the Servicing Stack Update (SSU) KB5062800, should generally require only one restart. The SSU is installed automatically as part of the cumulative update process, and Windows handles the installation sequencing internally to avoid multiple reboots.
That said, in some environments where pending updates or specific system configurations exist, you might still see an additional restart prompt — this is normal and ensures all components are properly updated. I recommend ensuring no other updates are pending before starting the installation to minimize the chance of multiple reboots.
Thanks and hope it is usefull .