Re: How do bitcoin addrss be too long?

Addresses can be up to 62 characters long. ref https://bitcoin.design/guide/glossary/address/ for the various formats.

If silent payment addresses are regarded as bitcoin addresses, they are 116 character but long.

Which addess is safer? Short or long?

All Bitcoin address are safe. Be it start from 1, 3, or bc1. Silent payment addresses starts from sp1.