Definitely try a 20 mile ride soon. I actually think ramping it up is a good idea so maybe doing one 30 mile ride in the next few weeks might be a good idea. I think it's a lot easier to increase in 3 10 mile increments than one 30 mile increment. Quadrupling all at once could make it feel more intimidating than it needs to be.
My guess is you won't find the increase to be much of a big deal, but better to make sure.