By default, in Active Directory authenticated users can join up to 10 computers to a domain. Administrators can join as many computers as necessary to a domain.

How many domain controllers do I need for 1000 users?

( If a site contains between 1,000 and 10,000 users in a particular domain, you should place at least two domain controllers for the domain in the site. ( For each 5,000 additional users a site contains for a domain, you should place an additional domain controller for the domain in the site.

What is the maximum number of groups a user can be a member Windows 10?

A domain controller can create “a little bit less” than 2.15 billion objects during its lifetime. Users, groups, and computer accounts (security principals) can be members of a maximum of approximately 1,015 groups. You can apply a limit of 999 Group Policy Objects (GPOs) to a user account or a computer account.