62 seconds
IT was really intended as a “dump and run” weapon.
You walked up to a confined space such as a car, dumo the magazine into the space, drop the weapon and run the hell out of there.
The idea was to kill everyone in the space, the weapon as a drop was cheap enough to produce so there was no loss to dropping it to free the perpetrator to depart, unfettered by having to tend to a spent weapon.