How important is constancy in meditation practice?

I'm going through a period of meditating every day which is not how I usually practice. Before I would meditate 5-6 times a week then deliberately not do more as I would seem to 'run dry' and lose my feeling for it and felt like a needed a gap. So I'm trying just to keep going and see how that works. But how important is constancy in meditation? - is it better just to ease off for a day if you feel depleted with it or would the thing be to keep with it even if the practice feels dry and barren. Many thanks as always