The amount of time it takes to be accepted as a node provider varies. There is no definite timeline in place.
You will need to get your proposal accepted as a node provider. The node provider proposal is independent of hardware and datacenter requirements.
To deploy nodes and obtain a contributing node provider that receives rewards, you'll need an additional datacenter proposal. You'll also need to onboard nodes for some time before they are pulled into a subnet and the remuneration begins.