You can say you can take 1 long rest per 24 hour period.because in reality, you can't.
players will take a long rest when they feel they want a long rest. period.
What will you do nuke the campaign? sure, you can, but what will that get you?
I also think you can add fatigue rules if they are resting too often. The characters bodies will loose their circadian rhythms and they will find it difficult to rest.
Players will always cheese the rules. My players always take Tiny Hut, for instance. One time, the enemies figured it out and they collapsed a tunnel on the group. The characters were buried alive. The only person to survive was the high-con fighter.