The Coupon exdate gap is a metric that indicates the required holding period (in days) before the coupon payment date to ensure eligibility for receiving the coupon.

It contains the number of days, plus the type of these days:

• Number of days: reflects the gap in days between the date an investor must hold the bond and the actual coupon payment date.
• Type of days: specifies whether the days are counted as calendar days or business days.

Understanding this metric is crucial for investors, as the timing of the holding period can impact their strategy, especially considering market holidays or weekends.