One of the largest lottery prizes here in the states was $386M...the lump sum payment option, which was taken, was approximately $193M.
After Federal taxes at the time, the remainder was approximately $135M, it was tax free in the state it was won in, due to no income tax in the state. Assuming they won something like that in today's economy, with the same net to the winner's pocket, that $135M will garner more than $2.43M in interest per year. The $2.43M figure is based on the "simple" calculation--most savings, T-bills, and such garner compounded interest, which would increase that figure somewhat. The state of the winner does not tax, so the earnings are not taxed, only the federal unearned income tax applies to the interest, fairly hefty based on the amount, but still leaves a tidy sum to live on.
I'd still like to hit around $500M in the MegaLotto in California...