Table 3.

Sample processing times (execution times are approximate based on multiple execution runs).

	Processing step	Execution time
OMOP to FHIR Server (Figure 1, yellow objects)	OMOP to OMOP JSON export (Figure 1 Process 1.0)	~30 minutes
	OMOP JSON to FHIR server import (Figure 1 Processes 2.0 and 4.0) *	~39 hours
FHIR Server to MENDS DB Figure 1, green objects)	Bulk FHIR export (Figure 1 Process 5.0)	~30 minutes
	FHIR export to MENDS/ESP import (Process 6.0)	~80 hours

^*Process 3.0 (validation) is not performed during production runs. It is only performed as part of Whistle transformation testing.