How Does the Daily Percentage Loss of Premium Compare between a 7-Day and a 90-Day Option?

A 7-day option will have a significantly higher daily percentage loss of premium than a 90-day option, assuming similar moneyness and implied volatility. This is because the 7-day option is on the steepest part of the Theta decay curve.

For example, a 7-day option might lose 10% of its value daily, while a 90-day option might lose less than 1% daily, making the short-dated option much more volatile to time.