I went home at lunch yesterday and did a first layer pour on my sons corner sculpt, then after work I finished the mold in a couple of separate pours.
I stripped the Lego mold box off this morning when I woke up and did a first run resin cast before morning sabbatical.
I think I pulled the piece out of the mold too soon because a few spots were squishy, but that pour was more to clean the mold of clay residue and silicon flash. I wouldn't try to sell that first cast anyway, so it doesn't matter if it failed.
I poured a second cast before leaving for work, it should be fully cured by the time my son rolls out of bed to go to work.