Those who complete (compleat!) the Munros can record this fact and receive the magic number by writing in to The Clerk of The List (See here). Additionally, a list of current compleaters is published annually in the SMC Journal.
David Harrison-Hall - 1425
Ben Vorlich (Arrochar) - 23rd July 1995
That's David holding onto the champagne bottle, in what looks like a fairly typical July day! He began his tour of the Munros on the 14th November, 1958, with Cairngorm, and here is some 13,401 days later (we'll take his word for the day count).