perendinate
until the cows freeze over
until the cows come home
collegewide
intercollegiate
intercollegial
postcollege
intercollege
imperishable
abiding
enduring
at length
graduate
inveterately
reside
long for
semicollegiate
long
long-lived
lasting
durable
long-lasting
lifetime
hot minute
long-span
eon
multicollegiate
grad student
graduate student
colleger
postgraduate
multicollege
academia
residentship
stopout
on-campus
master
academic year
intercollegiately
continuing
postundergraduate
chronic
postinstitutional
interuniversity
lowerclassman
underclassman
intracollegiate
with ages
anticollege
Old Etonian