The time must be longer than a period of a week, or allowing for betting on the day of the election. The markets can be separate, but should allow betting in some form of cryptocurrency.

(update)

A separate market or exchange is fine for US users. At least 80% of US users must be able to bet on the overall control of the House. The US market must allow cryptocurrency deposits and withdrawals. Other functionality besides election trading such as sports is irrelevant

I will not bet in this market.