Take the 2-minute tour ×  Because of our negligence towards the
issue since so long, ...  Am I using this correctly? I want to
convey something like 1-2 months ago or since around September.
share|improve this question for so long sounds much more natural
to me. –  Flimzy Nov 20 '12 at 18:16 In the first place, the
usual expression is "for so long," not "since so long." Second,
a couple of months may or may not represent a long time. – 
Robusto Nov 20 '12 at 18:16 @Robusto I didn't use "for so long"
for that reason. Should I still go with it? –  laggingreflex Nov
20 '12 at 18:25 The correct expression is "for so long" or
"since September", not "since so long" –  Kristina Lopez Nov 20
'12 at 18:45 If you simply want to indicate an indeterminate
length of time which isn't going to be misinterpreted as "for so
long" might be, you could use "for however long." That's a
contraction of "for however long we have been doing that" which
is in common usage and understood in British English, at least.
It's a bit colloq