I always try to go for 100% completion and collect every CG, but sometimes the game is just too long.
In some games, even when you choose a different romance route, most of the story remains the same. The same major events still happen in the same order, and the main differences are the interactions with the love interest, some dialogue variations, and the ending.
Because of that, if the game is very long, I tend to get fatigued and progress through it much more slowly. Since the shared scenes aren't completely identical and often contain small dialogue changes, I'm reluctant to use the skip button because I don't want to miss any details. As a result, completing 100% of the routes can be very time-consuming. But yeah, I always try to go for 100% completion. EXCEPT, I just get tired (which most of the time are due to simulation games that are very repetitive), in cases like that, I would delete the game LOL. (Since i don't have enough space)