There is no fixed dose of psilocybin truffles that guarantees ego death. Sensitivity, experience, mindset, and setting all play a role. Reports from experienced users suggest that ego dissolution is more likely at very strong doses, often somewhere in the 30 to 45 grams fresh truffle range, though it can happen at lower or not at all at higher doses.
Potency varies a lot by species, batch, and freshness, and individual body chemistry matters. Because of that, grams do not translate reliably to psilocybin milligrams, and I cannot verify any exact conversion.
If you choose to explore this, consider building up gradually across separate sessions, use a safe and calm setting with a trusted sober sitter, and avoid mixing substances. For a simple overview of how intensity tends to scale, see this explanation of trip levels: trip levels.
Stay safe and do not rush the process.