rks
Most concretors and engineers we have consulted don't like going over 1200mm as a maximum. And even then, depending on your ground conditions the engineers will typical want a brick/strip…

I had a similar issue with my sloping block. I overcame it by doing 2 DEB's to the ground floor.
Each build site is different as is each owners budget…

Both my drop edges are not a simple straight line across the slab. The distance between my DEBs varies from 4.1m at the narrowest to 8.1m at the widest.