The place where I colocate our servers (the company is probably in the top five in the industry in terms of size, with data centers in about a dozen cities) run

The place where I colocate our servers (the company is probably in the top five in the industry in terms of size, with data centers in about a dozen cities) runs with a tech staff of ~six during the day and two overnight. They've obviously got other staff for all of the other business-related roles, but data centers just don't require a lot of staff in the general case.