Use DISTANCE not time for navigation audible directions. When driving, distance is the only measurement. If I have 52 miles to my next action, the time to get there can vary with conditions, but the distance will not change. Hearing "continue for one hour and 3 minutes" has no value because if conditions change, I may only travel 30 miles. It is easy for a driver to estimate time based on distance and current speed. Additionally, the screen will always update estimated arrival time.
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Jorgen Caceres commented
This!!! It's incredibly annoying to suddenly get a time measure - keep it consistent!!!