i agree with kpeacock. in addition to that please find out the contingencies and unavoidable non value added times. i dont have any experience medical supply but can give you an example of manufacturing sector like sharpening tool, feeding oil, start up/ warm up time etc. so that you will get net available time for operation.
i will suggest you to gor for work sampling or stopwatch study. though this is cumbersome but it will give you a grip of TIME & MOTION STUDY.
later on you can go for PMTS for improvement in process.
also please keep in mind the nature & skill level of the person.
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