Data volume determines ingestion time. The more historical data your store has, the longer full ingestion takes. Your SourceMedium contact can give you a specific estimate based on your data volume.
If you have a specific go-live deadline and your data volume is very high, we can discuss starting with recent data (e.g., last 1-2 years) while full history loads in the background.
Trade-off: Starting with partial history means LTV calculations will only reflect the loaded period. A customer who first purchased 5 years ago would appear as a “new” customer if we only loaded 2 years. Once full history loads, everything updates automatically.