I split my Cannas several weeks ago and put them in one gal. pots. A couple have bloomed already and the plants were pretty small after the split. These are tough plants and seem to be very forgiving. They do like water. I have better luck with them in pots then in the ground, but that could be said about most every thing I grow.
I did not let mine dry up before replanting them. Just a brutal splitting and into a new pot !
Some of my Canna are in hot sun, some in filtered light.