Well, "practically speaking", sometimes plastic pipe joints remain leak-free for very long periods (years and years!) with
no "glue" whatever applied. I've seen joints using "all-purpose" cement come apart with very little mechanical stress.
So no one can tell you what WILL happen. If the person who used this "all-purpose" cement
has any ambition to actually learn how to plumb according to accepted practices, then he/she should willingly redo it with
the approved materials, gratis.