Duration from Slot 2 to Slot 4
A patient with three back-to-back procedures wants to know how long they will be on site. Compute the interval between the start of slot 2 and the end of slot 4 — that's the total time.
Expected output sample
This is what a correct answer looks like — its row count is its own, it doesn't have to match the schema tables.
| time |
|---|
| 02:35:00 |
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