I had my two Sudachi grafts take last week. Both were on Dwarf Yuzu trees. The one graft I had above the rootstock took in 3 weeks. The one below the rootstock took 3 months. I had just about given up on it.
Above Rootstock Graft Line
Below Rootstock Graft Line
I am assuming the one below took so long to sprout because I didn't force it by breaking the Yuzu and bending it over...