That's also what killed Rosendale cement. ~1 month cures as opposed to putting a structure on the slab as little as ~1 day after pour.

Yp, 42.5 cement was used for concrete and 3 hours later the forms were removed. It was around 30celcius outside and that helped but still, you can walk on that thing hour later

If it has a 1 month curing time, I would assume weather would affect outside structures more often as well.

Rosendale cement is a natural hydraulic cement - it was used for the foundations of the Brooklyn Bridge, the US Capitol, and the pedestal of the Statue of Liberty. It's actually more durable and weather-resistant than Portland cement.