This would make most landmines completely useless. Their value is in short to medium term area denial so you want the fields to last from weeks to some months.
While I tend to agree with you that in some cases (such as the Korean DMZ) there's massive utility in persisting mines, there are other ways to use them. If you look at how they are employed in Ukraine, you'll see both sides using rocket artillery to drop them behind enemy lines into the path of expected reinforcements or logistics. That's a much more efficient use of mines than using them as a medium term denial weapon over a broad area, and because of the placement you can expect them to be detonated, cleared, or bypassed fairly quickly, so a two-day timer probably doesn't lose you much utility at all.
While I tend to agree with you that in some cases (such as the Korean DMZ) there's massive utility in persisting mines, there are other ways to use them. If you look at how they are employed in Ukraine, you'll see both sides using rocket artillery to drop them behind enemy lines into the path of expected reinforcements or logistics. That's a much more efficient use of mines than using them as a medium term denial weapon over a broad area, and because of the placement you can expect them to be detonated, cleared, or bypassed fairly quickly, so a two-day timer probably doesn't lose you much utility at all.
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