If I have a residence permit in Latvia, how long can I stay in another Schengen Area member state without registration?

F.A.Q. answer:
If you posess a residence permit in Latvia, you can reside for business or tourism purposes in another Schengen Area member state for up to 90 days (3 months), without any registration. After that, if you are a third-country national (i.e. non-EU Citizen), you do need to apply for and receive a long term visa or a residence permit.