Yes I had an inguinal hernia...from the time I noticed it to the time I got it repaired was about 8 months. I continued to work out with it, and it probably got a bit bigger in that time....but didn't really have any pain except for a dull ache occasionally.
My friend has been waiting for over a year to have his repaired and he says his has grown quite a bit in that time.
I would say continue to train, but try to avoid exercises that put a lot of internal pressure in your midsection, like leg press or bent over rows.