limits on aws account iam users and policies

I am working on aws to back up my data. i want to choose following approach for backing up my data.

1. suppose i have n numbers of organizations and each organization has n number of departments and each department has n numbers of users.


2. i want to back up those organizations data based on organization > department >user structure.


3. now i have an iam user account and a bucket in aws s3.


4. 
   

   i create a folder structure based on organization structure as

   
   

   first folder for organization > subfolder for department > child sub folder for users

   
   

e.g organization name :ABC

department name : Developer

user name: testUser

so bucket folder structure on aws will be as

ABC/Developer/testUser/....

so here i show how i am managing organization's data on aws s3.

but now the point is i am allowing organizations users to put/get data to/from s3 on request.

after user's request i will generate federated user credentials for that user will policy which will allow user to put/get data to/from only users folder.

But my questions are:

Q 1. How many federated users can i generate. Is their is any limit for federated users?

Q 2. how many policies an IAM user can generate at a time?

Q 3. As my approach mentioned above their can be n number of federated users so can i generate n number of policies and applies those to federated user.

Thanks & Regerds

Amit Manchanda