10 to the 25th power years, and the universe is only 1.38 billion years old.

Specifically: the most powerful quantum computers currently have fewer than 100 logical qubits.
Breaking BTC's SHA-256 requires about 2,330 qubits, more than 20 times the current capability.
If a breakthrough occurs in the future, approximately 35% of the $BTC supply (including Satoshi's 1 million coins) could be at risk.
Of course, the key point isn't "whether quantum computing will arrive," but "whether BTC will upgrade its quantum-resistant encryption before it does."
For now, it looks like time is on BTC's side.