Hi
sold a domain this year, acquired in 2006
it earned ppc income from first day I got it, and was still earning a few $, when it sold.
however, the reason for holding that domain for 14 years, was because of it's earnings and it's actual name.
for another domain held same duration or longer, which may not earn any parking revenue,
the reason for it holding may be different.
also, each domainers method/reason for acquiring a domain and why and when they decide to sell it,
will have effect on hold times for that name, for that individual.
for instance:
one who buys future forward names and holds them for years until it's subject, becomes mainstream.
or those who bought 3 char com and 4N.com in 2006 for almost reg fee then and now they are in demand.
for some domains, you just have to wait and let their value mature.... like a savings bond.
imo...
,