John Rowland ) gurgled happily,
sounding much like they were saying :

... since two SP30s fell off it within the last month and a half.

How long do SP30s stay on your licence?

The points "count" for three years.

Do all speeding convictions last the same amount of time?

All points count for three years, speeding or other offence. They can
physically be removed from your licence after four years. Drink/Drive is
the only exception - they can't be removed until after eleven years.