Once I emptied a 15 gallon tank of all fish, planning to redo it. It sat for 4 months by my desk, with no filter, no light, no food, and just a couple of sickly Egeria cuttings. Nothin ever moved there, except a couple of mosquito larvae, planarias and daphnias.
When the water had evaporated to about 10 cm. depth, and started smelling, I finally decided to clean the tank, and found the khuli, fat and happy, half buried in the mulm at the bottom. The fish was 2 years old at least at the time, 4 years old now.
If a khuli can survive 4 months unseen in a nasty tank, a couple days missing in a clean tank can't tell you much about its status.