The Rellekka Rooftop Agility Course is available to players with an Agility level of 80 or over. You stop failing the agility course at level 89. A full lap of this agility course can be done in roughly 51 seconds, making the maximum amount of experience possible 55,052.4 XP/hour assuming perfect laps. Keeping this rate is very difficult to achieve and a player should rather count on getting around 50k XP/hour. Using this course alone, levelling up from level 80 to 90 would require 4308 completions of the course, meaning roughly 61 hours of training at the maximum hourly rate.