The decision to migrate off a PSA is almost always made 12-18 months after it should have been made. The signs are familiar: technicians have workarounds for everything, reporting takes hours of manual work, new hires struggle to learn the system, and the platform's support quality has declined. If three or more of those are true, you are already past the migration decision — the only question is when and to what.
The real PSA migration timeline is 6-9 months from decision to fully operational on the new platform. That includes 4-6 weeks of evaluation and contracting, 6-10 weeks of configuration and data migration, 4-6 weeks of parallel running, and 4-8 weeks of post-cutover stabilization. Any estimate shorter than 5 months should be treated skeptically unless your PSA is a simple implementation with minimal customization and under 5,000 open tickets.
The data migration decision is the hardest part of any PSA migration. Most operators try to migrate everything and end up with corrupted historical data, broken relationships between tickets and assets, and a new PSA that's harder to use because it's carrying 10 years of data in formats the new system doesn't handle cleanly. The pragmatic approach: migrate contacts, companies, and active contracts. Do not migrate closed tickets — archive them in a read-only export. Do not migrate time entries older than 3 years. Do not migrate knowledge base articles you haven't reviewed in 12 months.
Running in parallel is painful but necessary. The typical parallel-run window is 4-6 weeks: new tickets and time entries go into the new system; historical lookups and active contract management stay in the old system. Define a specific cutover date and stick to it. Parallel running that extends beyond 8 weeks typically means the migration has stalled and needs an external deadline to complete.
The cutover moment is the point where the old PSA goes into read-only mode (if possible) or is simply no longer used for new entries. This is where you discover everything the migration didn't catch: automation rules that didn't transfer, integrations that broke, billing configurations that produce incorrect invoices. Plan for a dedicated sprint in the first 2 weeks post-cutover to address these — they are inevitable, not a sign that the migration went wrong.
Operators who have successfully migrated recommend two things consistently. First, get executive buy-in on the migration timeline from the beginning — migrations that lose leadership support mid-process stall indefinitely. Second, invest in training before cutover, not after. Technicians who are trained on the new system before they need to use it in production make significantly fewer errors in the first 30 days.