You do you, but that seems to be extremely short sighted. Have you ever tried it? Because I use it in my game and aim for 5-10 encounters between long rests which, yes, require a week of downtime. I find that it simply suits the pace of the story better. It does means spellcasters don't go nova every encounter, how is that a bad thing? My players seem to enjoy it and it really does help balance things out between casters and non-casters. But I guess you know better than I or my players do.
I
do tweak durations a bit, any spell that lasts a half hour or more the duration gets multiplied by 5.