John and Doves,
 
Gary B, I reckon the number of years between is 3,333.
 
Or for days, 1,216,999.
 
The days digits add to 37 BTW.
 
Interesting also that 216 is sandwiched between 1 and 999 which add to 1,000.
 
But I could be out a bit there.
 
Phil.