Question: What is the longest an average pre-teen could stay awake without napping or sleeping

In general, children need more sleep than adults because their bodies are still growing and developing. Adults need about 8 hours sleep a night, so teenagers would need at least that for the best brain and body functioning.
Usually, after 2 or 3 days of no sleep, people start developing really bad problems because you can’t function properly.
There is a disease called Fatal Familial Insomnia in which people can no longer sleep, but they do have very, very small periods of sleep-like seconds to minutes. These poor people die within 3 months of the disease starting. Thankfully this is a very, very rare disease.