But if you want your prints to last, you should use Canon premium paper.
Have you checked the price of Canon premium papers?
There is no free lunch.

Why not Ilford? Will Ilford not last? I have many friends who used
the S520 with Ilford paper which IIRC uses the same ink.

So it's 64c a sheet. Ilford's Galerie fetches about 60c a sheet at
the local camera shop. Costco's Kirland paper made by a *cough*
unnamed Swiss maker for 15c a sheet.