Magda, you have the right of it!
1. Just accept that they are going to stop and search, and any buffs are history. This is pretty common, and sometimes the reasonable thing to do.
2. Loudly and clearly say, "No!!! You will not waste the blessings of my god by stopping to search for loot right now!! The loot will still be there in a few minutes, but the powerful blessings gifted by my god will not be. Do not disrespect my god! We will CONTINUE RIGHT NOW, then come back later to search."
Do this in an assertive way that brooks no disagreement. It should be fine so long as your Cleric doesn't do this sort of thing very often.
I would jump for joy if either of these scenarios played out. The problem stems from 4 players wanting to take their time and quietly stealth and examine things. And 1 cleric who EVERY TIME insists that his character must have about 6-8 buffs up to be effective. The problem arises when the party (and DM) say that minutes have been spent investigating a location and 1 cleric insists that it has been seconds.
So, now we count rounds as they occur. Hopefully problem solved.
Anzyr, I see what you mean now about perception. I thought you meant "reactive" perception as a keyword. And the actions you called out would have been move actions (not free - they were looking for stimulus) so they would have taken time, and not all of them were doing it. Also takes 10 rounds for a person to just remove 1 suit of chain mail. If they have help they can get it down to 5 rounds (during which time they both can't be reading, checking for traps, detecting magic etc..). I still think 7-8 rounds is crazy fast....but that is just me.