I grow a dozen or so Renantheras - mostly species - with my ( strap-leaved) Vandas - all hanging up , all potted. The renantheras get sprayed daily in summer, twice daily in hot weather ( pretty rare this year in UK ! ) and every few days in winter. Spraying is with rain water. They also get dunked in water/fertiliser mix, every couple of weeks. Ren. storei and phillipinensis for example grow several pairs of leaves a year, and flower every few months ; monachica and bella, with different kinds of leaves , much thicker, narrower, and harder, are much slower, and usually flower only annually. R citrina is also a fast grower, as are the few hybrids I have.
The first one I had, bought perhaps 8 or 10 inches high, grew too tall - over 5 feet including the spike, and I couldn't get it in my car to take to shows, so I recently chopped it in half - there were plenty of long aerial roots on both parts - and it took 6 weeks for the bottom half to break out a new growth ;the top half has started some new roots and a new leaf too. I reckon I have had that plant about 3 years.