How do global Sage X3 enterprises support their key users (and maybe some end users) in various timezones?

I'm talking about support for day to day functional (X3 screens/workflow) and technical support (error messages, basic report changes).

Assume one global X3 implementation hosted say in the US and 20 users in each timezone.

- do they stand up their very own 24/7 support desk in-house?

- do they employ/designate a person on the ground in each location?

- is it possible to utilize Sage Support desks in US and UK?  (and China?)

- it is possible to engage separate sage partners for support in US, UK, and China?

- What Sage Partners actually have global operations to implement and support globally?