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@lae
Cup-and-cone bearings last for years and years with regular maintenance (my old 1950 Claud Butler was still on its original BB cups and axle).
A thing to remember with square-taper cranks is that they're not designed to be removed and re-installed as this will eventually enlarge the tapers - so a sealed no-maintenance BB is perhaps a better option than reinstalling every six months.
Steel chainrings last for ages and ages.