FPTP, AV, BV, SNTV, List PR, Borda Count, and STV all generally require just one election on one day (though the size of India’s FPTP elections require that they be held over a period of four weeks), as do Parallel and MMP systems. Two-Round systems are more costly and difficult to administer because they often require the whole electoral process to be re-run a week or a fortnight after the first round.
