It may depend on the material. My recollection is that, when my usual shoe was a canvas low-top, I'd get maybe six months out of them before I probably shouldn't have still been wearing them in public (but then I'd stretch another 3-6 months out of them, sometimes with full-on holes, separating soles, or torn seams by the end—and I am not especially hard on my shoes, but then again I only ever bought cheap sneakers)

I am seemingly hard on my shoes, as most cheap pairs I've bought last 3-6 months before the soles start to separate or fall apart. But my Converses have generally lasted around a year looking nice enough that I'd still wear them for more dressed up non-formal occasions, and another year as a slighty scuffy looking walking around shoe.

I think all the actually-Converse shoes I've owned were the Target version (One Star? Something like that) that were "Converse" but were mostly likely much worse than the standard kind. A case of you-get-what-you-pay-for, most likely.