There is no limit. Without having to pay more for it, you can forward to your new address all the correpondence that was sent to several people.
We can only forward the mail whose recipient's name matches completely that name that you provide in the resquest form. For this reason, we advise that you write down all the possible ways that each person can be addressed.
For example: if you only write James Smith, the mail sent to James Earl Simth will not be forwarded to the new address.
If there is not enogh space in the form to write down all the names, write them in another form and annex it to the original request form.