As Revvy says, 3 weeks at 70 minimum. Everything will carb eventually with time, but Ive noticed a big increase in carb times with air temps at slightly less than 70. This winter has been nutty with the mild temps, my basement is actually cooler because the furnace hasnt been running as often to heat the upstairs.
Many people on the forum build some kind of warm box or use a closet with an incandescent bulb for heat. Some suggest using a metal coffee can to block the light.
Recently ive been using an adjustable aquarium heater bath in a plastic tote many use for primary ferm temp control. Just keep the water level below the caps and the heater off the plastic. I find the thermal mass of the water bath to be better suited to my unfinished drafty basement. My current version will hold two five gallon batches worth of 22oz bombers, has a pump to keep water circulating, and overflows to maintain water height.
Its over the top but I like it.