Is Sans fight easy?
Sans is the final boss of the Genocide Route. His fight is widely considered the most difficult in the game among players. Sans uses bones and straight beam projectiles that emerge from skeletal faces, known internally as "Gaster Blasters," in his attacks.
The Sans fight is the hardest boss fight in the genocide run, like on a scale of 1–10, 1 being easy as pie and 10 being hard as a diamond, I'd say a 20, it took me 10 tries to beat Sans my first time (I can beat him on my first try now), and it happens at judgement hall after you kill Mettaton NEO and talk to Flowey ...
Even if you grind up to level 19 you wont be able to fight sans unless you have done a genocide run up to that point.
Sans has 1 Attack. He just uses Karma, so his 1 damage hits you every single frame. Sans has 1 Defense.
When focusing on the main objectives, Undertale is about 6½ Hours in length. If you're a gamer that strives to see all aspects of the game, you are likely to spend around 21 Hours to obtain 100% completion.
The total number is definitely around 95-120, but it's probably better to focus on the other aspects of the Genocide Route (Encounters without monsters, slowed music, unique dialogue) than the kill count.
The only way to progress in his fight is to attack. If you use an item or "Check" Sans, the battle will not progress and he will repeat the last move he just did. Whenever you get hit by one of Sans' attacks, you take Karmic damage.
Once Sans falls asleep, you can push the box to the left by moving left. Then push the box down to the "Fight" option in the menu and select it to deal a final blow to Sans. Congratulations! You win!
Sans is considered to be the hardest boss in Undertale, not in gaming. If you have heard that claim, they are incredibly wrong, as there are far more harder bosses, if not games that could make the fight with sans look like a fight with a froggit. Sans's battle focuses on movement, response time, and awareness.
The total number is definitely around 95-120, but it's probably better to focus on the other aspects of the Genocide Route (Encounters without monsters, slowed music, unique dialogue) than the kill count.
Is it possible to fight Sans in pacifist?
No, there is no way to have a pacifist Sans battle.