The daily roulette bonus, challenge logs exist and give EXP that can be used to your advantage.

This is a recurring theme in FFXIV: it's more efficient to do something by doing little chunks of it over many days or even months. If you're looking to rush your second level 60 job in a week, then the answer is "deal with it". But if you do the daily roulettes and set aside the challenge log EXP properly, you won't feel any grind at all.

If you want quick 60s yet can't deal with the concentrated grind, then you're just not up to it, and the daily and weekly EXP bonuses described above are exactly what has been done to relief you of the grind.