What is the maximum number of nodes possible in the Digimesh network? s3 (900hp pro)

First of all I would like to apologize if the questions are basic, but they are information that I did not find. We are implementing a digimesh network in an industrial environment and I have some doubts. Here are some questions:

What is the maximum number of nodes we can use per gateway? Example 1500 nodes 900hp s3 per 1 conectport x3?

What is the maximum payload? 73 bytes?

What is the maximum number of possible hops in a network with 500 nodes or more?

In industrial environments what is the average range achieved? Using 5db dipoles antennas.

In open environments with line of sight, what is the maximum distance reached in your practice?

The radio I am using is the Digi XBee-PRO 900HP s3 with digimesh firmeware.

Thank you very much in advance.