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.