Now that the weathers picked up I daily mine doing a 6 mile round trip. When possibly I go the long way doubling the distance going to work, mainly just for more time in the car as they drive just so fantastic.
Every morning I'll allow the car to warm up, even for just 30 seconds before setting off the drive. Then again when I'll get to work if gone direct, it'll idle for maybe a minute before shutting off.
It's a basic but generally robust tried an tested engine and we all use good quality oil so for me the only adverse effect I notice is the reduced mpg.