The phrase "long marathon" means a task or journey that takes a lot of time and effort to complete. It implies that patience, perseverance, and endurance are needed to reach the goal. Full definition
The headset's comfy cans deliver rich audio for both competitive and immersive games, while its lightweight, travel - friendly construction makes the headset ideal for hours - long marathon sessions. (tomsguide.com)
But I needed other women who would reassure me during those 2 am nursing sessions and four - hour long marathon cluster feeds. (breastfeedingtoday-llli.org)
The great thing about investing is that it is not a 100 meter dash; it is decade long marathon. (thecollegeinvestor.com)