When I had my first born the guidelines were 2 hours max so I'm sure a little bit over an hour will be absolutely fine x
We’ve always tried to finish within 2 hours max. As that’s what it says on the tub (to use within 2 hours). So it’s fine.
I always go within 2 hours, 1 hour seems to unachievable sometimes
I've done 2 hours and no issues