Not sure where you get that. When I tried, I went with $80,000 and gave her the kids. At worst, spousal support was marginally higher than child support.
Spousal is dependent on incomes of both parties as well as length of co-habitiation.
Anyway, I tried on two different calculators and neither gave me the figures. And in one case, it said I would have to pay between 0 and 4 years. But it equalled child support.