Quantum computing stocks were red-hot recently, but Jensen Huang just offered optimistic investors a reality check.

Jensen Huang’s comments at last week’s CES about quantum computing being decades away stirred up discussion within the quantum industry.

Shares of quantum computing company IonQ ( IONQ 5.48%) raced higher this week. The stock was up by 28.5% as of Friday morning, according to data provided by S&P Global Market Intelligence.

Stocks and ETFs tied to quantum computing rose significantly Wednesday after Nvidia and Microsoft highlighted the industry's enormous potential.

CEO Jensen Huang lit the entire quantum computing sector on fire last night after saying the technology won’t be “very useful” for at least 15 years and maybe as many as 30 years. He may as well have poured gasoline on the industry and thrown in a lit match.

Therefore, Huang's prediction that quantum computers won't go mainstream for 15 to 30 years sounds reasonable. It took Nvidia about two decades for its gaming and professional vis

Quantum computing stocks were red-hot recently, but Jensen Huang just offered optimistic investors a reality check.