The head of the Tokyo Stock Exchange sees a "realistic” opportunity that trading hours will be extended, as the bourse deepens discussions over the merits of a longer cash-equity trading day.

Hiromi Yamaji, the president of the exchange, told Bloomberg TV in an interview on Monday that it looks more feasible to extend hours than the last time the issue was debated in 2014. Then, a mooted evening session was shelved amid opposition from brokerages.

"I feel that the trading hour extension looks more realistic than the last time we discussed,” Yamaji said in the interview. The Tokyo Stock Exchange has formed a working group to debate if trading hours can be lengthened past the current 3 p.m. close, which would be the first extension in more than a decade.