I was given viscous lidocaine in GI cocktail how long does that stay in your system?

It is difficult to predict how long lidocaine will stay in your system. Are you feeling any unwanted effects?
An overdose is serious and can be fatal. Overdose symptoms may include uneven heartbeats, seizure (convulsions), coma, slowed breathing, or respiratory failure (breathing stops).
See your doctor if you are concerned.

See: https://www.drugs.com/mtm/lidocaine-viscous.html