The ultra-rapid product, useful for real-time and near real-time applications, at regular intervals four times per day; the ultra-rapid solution includes both observed and predicted satellite orbits and clocks. The rapid orbit and clock combination is a daily solution available approximately 17 hours after the end of the previous UTC day. The final, and most consistent and highest quality IGS solutions, consists of daily orbit and clock files, generated on a weekly basis approximately 13 days after the end of the solution week.
Source: https://cddis.nasa.gov/Data_and_Derived_Products/GNSS/orbit_and_clock_products.html