Need Better DAX Query

I was assuming that if the elapsed time is blank amd ageing Mins > 240, irrespective of the priority, the result should be ""OUTSIDE SLA" (which is what the first line of code in the Switch expression checks).

If there are different criteria for each priority where the elapsed time is blank, can you specify them?

Does your second method deliver the expected result? If so, it can also be written like this:

SLA MET 2 =
SWITCH (
    TRUE (),
    Incident[PRIORITY] = "1 - Critical"
        && OR (
            Incident[Actual elapse time] > 240,
            AND ( Incident[Actual elapse time] = BLANK (), Incident[Ageing Mins] > 240 )
        ), "OUTSIDE SLA",
    Incident[PRIORITY] = "2 - High"
        && OR (
            Incident[Actual elapse time] > 480,
            AND ( Incident[Actual elapse time] = BLANK (), Incident[Ageing Mins] > 480 )
        ), "OUTSIDE SLA",
    Incident[PRIORITY] = "3 - Moderate"
        && OR (
            Incident[Actual elapse time] > 7200,
            AND ( Incident[Actual elapse time] = BLANK (), Incident[Ageing Mins] > 7200 )
        ), "OUTSIDE SLA",
    Incident[PRIORITY] = "4 - Low"
        && OR (
            Incident[Actual elapse time] > 10080,
            AND ( Incident[Actual elapse time] = BLANK (), Incident[Ageing Days] > 10080 )
        ), "OUTSIDE SLA",
    "INSIDE SLA"
)