10 years seems to be the accepted answer, though one caveat I found was if you buy cheap don't expect it last if it is running regularly.
I haven't been buying the cheapest ones, nor the most expensive ones. Pretty much the middle of the range.
Sometimes I'm glad I'm from an area where they don't even need to install the sumps.
Yeah, sometimes I find myself wondering whether having the basement is worth dealing with sump pumps and seepage.
Sounds like you've got something else wrong or your pump is running harder than most areas.
Well, I am starting to suspect that we have some drainage issues, so yeah, the pump may be working a little too hard. I'm also thinking that on the previous one I may have mounted the float switch a little too low, causing the pump to cycle more often than necessary. When I installed the new one last night I moved the switch up about 4 inches from its previous location.