I did 5 lines sat. night, ending 300 a.m. of c. I had a urine test
thurs. at 230 p.m., 107 hrs later should it have cleared my system
yet?

Depending on how much cocaine you've done previously, you may or may
not be safe.  Some information you might want to read is present here:

http://www.druglibrary.org/schaffer/cocaine/clearurine.htm

"The widely accepted time period for benzoylecgonine to be cleared
from the urine is three to five days. One study suggests that high
dose users (i.e., 0.5 gram or greater for each episode of use) can
test positive after eight days. Another study claims that
benzoylecgonine can be detected in heavy cocaine users for 10-14 days.
The longest time over which positive urine levels of benzoylecgonine
were detected was 10-22 days. This was after chronic use of extremely
high doses of 112 grams per week. Since it is usually difficult to
determine exactly how much cocaine is being abused by a caller, it
seems that a broader range of potential detection times should be
given when explaining cocaine metabolism in regard to urine testing."

Craig

You'll be fine as long as that is all you did 72 hours pervious to that.

If you're taking a UA, it'll be fine.