This is not correct anymore..
You can drive it for 90 days a year, as long as you have a logbook
Which pretty much means you fill out the logbook before you go, except the date field.
Get pulled over? Write date down quickly, and then you're good to go.
Mate with Club reg BMW has actually been asked exactly 0 times for his logbook the 4-5 times that's been pulled over/through a booze bus etc.