How long do numbing treatments for lacerations last?

Answer 1

Doesn't that depend upon the following?

Depth of laceration
Specific numbing agent
Amount of numbing treatment administered
Patient susceptibility

Answer 2

depth - about half an inch
agent - i think i heard him say novocaine
amount- 5 shots at wound site
susceptibility - not known

Answer 3

this is not for homework but for my own knowledge - skip over me if you choose