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Tank needs 8 minutes less to empty the tank than it needs to fill it.
Should we use 'lesser' here as 'than' is used for comparison. Please clarify it.
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Tank needs 8 minutes less to empty the tank than it needs to fill it.
Should we use 'lesser' here as 'than' is used for comparison. Please clarify it.
"Less" is grammatical here. I suspect what is bothering you is that the sentence is awkward. That does not make it wrong (although some may say that "fewer" is preferable to "less").
Filling the tank takes 8 fewer minutes than does emptying it.
Should we use 'lesser' here as 'than' is used for comparison.
No, you shouldn't.
lesser is not applicable here as one quantity of time (that of emptying the tank) is smaller than another (that of filling it) and it's an exact use case for ...less...than....