Human circadian rhythms can only be stretched so far.
For now—growth mindset!
But apart from that, a Martian day is only 40 minutes longer than an Earth day. So I expect it would still be fine for current human circadian rhythms, and measuring time in Earth days would be inconvenient for Martians.
I always thought a standard day would be a better base time than seconds. Human circadian rhythms can only be stretched so far.
For now—growth mindset!
But apart from that, a Martian day is only 40 minutes longer than an Earth day. So I expect it would still be fine for current human circadian rhythms, and measuring time in Earth days would be inconvenient for Martians.