(For a related story on the elections, click on [nSP280716]

(For a factbox on the Philippines, click on [B614617]

May 11 (Reuters) - The Philippines holds congressional polls on Monday and almost every elective seat in the country, except for the presidency and the vice-presidency, will be up for grabs.

Following are some key facts on the elections:

- About 45 million eligible voters can cast their ballots from 7 a.m. (2300 GMT Sunday) onwards in more than 300,000 polling areas in 81 provinces.

- Half the 24 seats in the Senate, all 275 slots in the House of Representatives and almost 18,000 posts in local government will be contested.

- Various opinion surveys show 6 of the 12 seats up for grabs in the Senate would go to the anti-Arroyo camp, with the administration taking four and independents two.

- Government supporters claim they can win over 200 of the seats in the House of Representatives.

- In most smaller cities and municipalities, the counting and tallying of votes should be completed in about 24 hours with the winners proclaimed in two to three days.

- Results for elections in the Senate may not be finalised for four weeks. Results may also be delayed if losing candidates file protests.

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