Arbitrage is good, sure. But what is the timescale that is useful? Is sub-second resolution of arbitrage actually useful? What is the argument against Arbitrag

Arbitrage is good, sure. But what is the timescale that is useful? Is sub-second resolution of arbitrage actually useful? What is the argument against Arbitrage having a lag of even, say, 90 seconds? And like... who cares about the price delta on a time scale even less than an hour apart from day traders? FX stuff I guess?