Tuj,
Hypoxia is unlikely to occur below 10,000 ft. If it ever happens at a very high altitude, let's say 40,000 ft, TUC is nearly 12 seconds after rapid decompression, or 25 seconds after a gradual decompression with minimum physical activity. Would'nt that be long enough to put the oxygen masks on and commence a descent to MSA??
According to EASA, no hypoxia training is recommended at all for commercial flying.