[larsdangly]

I suspect most groups will prefer a bit of looseness in the application of these rules, particularly the handling of the 'clock' and the determination of difficulty levels of rolls. However, for the narrower situation of a labyrinth delve (or similar tactical-scale situation) that is being played out literally turn by turn on the table top, the GM should prepare set difficulty levels for spottable things (much as you would for hidden traps), and should specify to the table the number of turns required for non-default spot checks (by default I would assume 6 turns/30 seconds, as that is what is spelled out in ITL).