Is it true? Let's find out!
The most important part is to find sufficiently large number of "other surfaces":
From the left: modeling clay (plasticine), tea candle, phone card, aluminium foil, plastic buckle, glass mirror. The superglue package at the bottom is our test specimen. Room temperature is somewhere around 20°C.
Three drops of cyanoacrylate were applied to every test surface.
The puddle in the clay cup slowly starts to dry around the edges. The puddle on black plastic slightly dissolves it and unexpectedly starts to dry from the bottom. All other specimens are still completely liquid.
Clay pool continues drying. Black plastic dissolves further and something similar begins to appear on the phone card. There is still a liquid on the wax and aluminium. As well as on the mirror, I just can't persuade the camera to focus on it.
The glue is more or less completely dry on the clay, except for being a little soft under the surface. Strange brainlike structures develop on the plastic buckle. The phone card tries to catch up, but is slower. On the glass, the drop gains a thin dry edge. Wax and metal are boring, still nothing has happened.
The clay specimen continues curing, followed by the black buckle and the colourful card. Surface of the aluminium pool has solidified and crumpled, the glass one slowly widens its dry rim. Still a liquid in the candle.
The glue on clay is perfectly dry and rock-hard. On the two plastic surfaces, the drops are just a little soft somewhere deep inside, and look like a pile of tangled nano-worms under an electron microscope :-). In the aluminium, the puddle continues drying from the surface down. The droplet on the mirror begins to look like an eye. The candle... still nothing. Impossible!
While curing and hardening (and contraction of the "pupil" on the mirror) proceeds on the whole battlefield, the candle-dwelling puddle still resists. I tried to poke it with my fingernail; the glue is thicker than before, but still liquid and without any dry stain on the surface.
Maybe there is a slight stain forming on the candle pool. Or maybe it's dust.
Still liquid in the candle, although thicker.
Glue pool in the candle is still soft, but no more usable for gluing. So we're done.
Sorted from the fastest curing to the slowest, the materials go:
clay, plastic, metal, glass, wax (paraffin)
Conclusion about tea candles keeping superglue liquid for the longest time is therefore obvious:
*** CONFIRMED ***
There may be some even better material lurking somewhere in the unexplored regions of the universe, but I don't care.