Allow showing route without starting voice navigation directions
Their time to when you want to see the route and know how long it's going to take without actually starting voice command navigation. I would suggest adding another button in the route dialog box next to the go button or the routes button that just says "Route Only", or have a checkbox there that turns off voice navigation (so when you tap Go it just shows the route and time to destination).
Juvescent Joys commented
tap the tiny speaker top left above buttons in pop-up palette