Once OSR has set in buckets and has been re-heated, it tends to stay liquid well-enough.
The biggest problem is getting out out of the comb before it sets hard but ensuring the water content is low enough so the honey doesn't ferment.
As has been said, OSR yields well and bees do well on it - with or without neonics it seems - so honey comes in very rapidly so you can find that the brood-nest is full of honey where the queen should be laying and the super(s) are full in a matter of days. If you are then thinking of putting on a super, put on two!