"I am a traditionalist but I am not that frightened by four-day Test matches," Chappell was quoted as saying by cricket.com.au.
"It was only the early part of last century they had unlimited days for Test cricket, never ending Tests, they used to go seven or eight days," he said.
"In this day and age you have to consider these things," the former cricketer said.
"If you played enough overs in the day, and I think they're talking about 100 overs in the day in four days, that's 400 overs of Test cricket," he said.
"I think any business, and sport is a business, I think more than anything else if you don't continue to be evolving you're likely to be going backwards. I think we should look at all these things," he said.
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