France has upped the ante in the quest for fusion power by maintaining a plasma reaction for over 22 minutes – a new record. The milestone was reached on February 12 at the Commissariat à l'énergie atomique et aux énergies alternatives (CEA) WEST Tokamak reactor.
It was about 1800 years between the first steam engine and a practical steam engine. I’m sorry that one or two generations is too long for you.