If I'm going on a 20h trip where 14 of those are in the air, flying business means I'm tired when I get to my destination but can function the next day - as opp

If I'm going on a 20h trip where 14 of those are in the air, flying business means I'm tired when I get to my destination but can function the next day - as opposed to 5 useless days when flying economy. If that trip is for anything less than 3 months, the price difference can be well worth it.