interesting, i've never heard anybody rebooting their control station every 90 days. I don't touch mine unless we are having an issue with Celerra Manager or we are doing DART upgrade.

It is a dated recommendation. We used to have that a few years back on 5.5 code, due to a Java memory leak.

There is no fixed recommendation and regular reboot isnt necessary.

If you do have an actual problem a control station reboot is quick and painless.