Yes, decades. Like at least 300,007 decades.

Also ballistic weaponry was remarkably effective against the jaffa and human soldiers of the goauld because, despite the system lord's technological edge, they had focused on using terror tactics to cow primitive cultures and when facing more advanced civilizations stuck to orbital bombardment so never really developed personal armaments aside from their own personal shields, which they didn't give to their troops.

It was less about how effective old weapons were, and moreso the Asgard's stupid-advanced way of thinking was ineffective against the replicators and needed to dumb it down with human ingenuity