I have had 3 cases before the PRTB.
2 for landlords trying to get rid of non (or part) paying tenants who were destroying the property.
both took approximately a year to get resolved before the PRTB, one has gone to the High Court and Supreme Court (lay litgant) while the PRTB are now taking criminal proceedings as the tenant has failed to comply with the determination in the other.
It must be close to 18 months now since both entered the PRTB process.
I acted for a landlord who changed the locks on a tenant, it was before the PRTB within weeks although the determination took a few months to come out.