Soviet/Russian UZRGM grenade fuse burns out in 3.2 - 4.2 sec (it's used in all Russian grenades and their chinese copies, except the latest Russian RGO and RGN). Type 67 grenades (and Type 77 apparently) explode after 4.5 - 5 sec. WY91 is reported to explode after 2.8 - 4 sec. Too long delay is rather bad, actually - because your chances to get the grenade back increase in some circumstances, as well as the enemy's chances to survive.Normaly, grenades are set for six seconds. But because of diffrences in individual manufacture, it could be anything from eight to four seconds before detonation.
Soviet/Russian UZRGM grenade fuse burns out in 3.2 - 4.2 sec (it's used in all Russian grenades and their chinese copies, except the latest Russian RGO and RGN). Type 67 grenades (and Type 77 apparently) explode after 4.5 - 5 sec. WY91 is reported to explode after 2.8 - 4 sec. Too long delay is rather bad, actually - because your chances to get the grenade back increase in some circumstances, as well as the enemy's chances to survive.