If you're using Outlook for Microsoft 365, you can now have Outlook end your meetings a few minutes early or start late. This can help you build in travel time between meetings. You can choose a different duration for meetings under one hour and meetings over one hour.
Select File > Options > Calendar > Calendar options
Check the Shorten appointments and meetings checkbox and select End early or Start late, depending on what you want.
Use the drop-down to select the number of minutes for meetings less than one hour and one hour or longer, then click OK.