Always want to reduce the gap between 2 tenants to *0* days.
In reality, it is a bad practice, even it means you could save some rent.
Always spacing at least 3 days.
With 0 day gap, you push to corner without room to handle the unexpected.
Landlording is a business - longer term business.
You try to do things right and professionally, and then think about squeezing out the last drop of juice.