Duration from slot 2 to slot 4

A patient has three back-to-back procedures and wants to know how long they will spend at the hospital. Calculate the interval between the start of slot 2 and the end of slot 4 — this is 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

Your query result will appear here

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