Is the husband liable for anything if the wife waived her right to maintenance during the iddah (waiting period) and then demanded it after its expiration?

If the divorce is revocable, the divorced woman is entitled to maintenance for the duration of her 'iddah, by consensus. If she, being an adult of sound judgment, waives it, her waiver is valid, and the husband's financial obligation for the past, before her reconsideration, is discharged. However, she may demand future maintenance, as its obligation is renewed each day.