Assuming you'd be making $600 clear every month from renting it--and there'd be no additional expenses, which is pretty unlikely--but, say, this is the case. If so, at $600/month, it'd take you 166 months to save $100,000. That's almost 14 years.
On the practical side of things, during those 14 years you'd probably have to invest some money in the property. Let's say $10K. Now it'll take you another year+ to get to the $100,000.
And, oh yeah, you'll have to pay taxes on the income of $600/month.
I don't know if you'll have to pay capital gains tax on the $100,000, so I can't figure that part of the equation. But, to me, I'd sell the place and breathe a sigh of relief.
Think about it--you could have good tenants, bad tenants, no tenants (and the property would sit vacant, just being an expense for you).
A friend of mine was a landlord for a while--the property was an investment, not your situation at all, but still--and she was beyond relieved when she finally sold it.