Hey there Cinders
Time is something Orchids, in general, seem to take a lot of

. Paph concolor isn't particularly slow but then again it won't perk up and get to flowering size within a year of being deflasked either.
It helps a great deal if you mix seedling size plants with larger near flowering size ones. That way you get the reward of flowers while watching others grow up. What can I say - it's working for me.
In general, your multiflorals tend to be slower than the singles. Maudiae types can flower three years after being deflasked and I've also seen some complexes do as quickly. When talking about Paphs and growth to flowering size, count on an average of 3 to 4 and a half years for mature seedlings to flowering size plants. The other thing is that each growth only flowers once - if it "blasts" you may have to wait a couple of years (or more) for your next chance.
There are other orchids which are just as "slow" to get to flowering size. I like to think of it as a plant like "snow ball" effect. a small plant doubles its size in a year. The next year it doubles again (just an example) next thing you know your multi growth plant is splitting the pot
One of the hardest things about orchids is learning that if you over feed or water them in an attempt to speed things up then, more often than not, they die. It's still a problem I suffer from occassionally
Cheers
Stephan