I think it's more Maren going from ignoring the fact that Sythe is nude to not ignoring it.
Relatedly, I don't think the implication here is necessarily that there is all that much for her to see at this point; I think Sythe's sentiment is basically 'So... [you're welcome to find out]', or 'you tell me.'
I do hope she doesn't hit the booze too hard. Or grabs something non-alcoholic, even, whether intentionally or not
"On the 28th of August, Year 482, [...]"
And Landen has the coffee cup that names days. (I think it's hit at least all of Monday - Thursday). Other than that, not that I recall, but my memory is far from fresh.
Could always argue translator convention if you want. I don't think it's really significant either way -- as people have noted, time divisions are inherently arbitrary. The thing I personally think would be cool would be a longer or shorter second. I think that might be more psychologically significant than other alterations. (But also it's not like there's any indication that the people in Twokinds are as inherently aware of the ticking of time as we tend to be with all our clocks and devices and relatively exact schedules.)