Doubtfull it needs to be done immediately since plug tubes don't leak huge amounts of oil & if a coil misfires it will light the CEL dash light. Don't know mileage of your future Box but there's a chance the most immediate need for it is replaceing the VarioCam chain wear pads. The original wear pads always wear & small pieces break off until around 80,000 miles they can be worn enough to alter camshaft timing. For this reason any 97-2002 Boxster should have the new improved material wear pads installed. I agree with post #2 about approximate hrs for sparkplug tube & coil repacement , if done while replaceing wear pads no additional labor. 
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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