The only spoiler for Avengers: Endgame is our tiny bladders.

The epic movie event every Marvel fan was waiting for is finally here, but are you ready for it?

I'm not talking about the plot. I'm talking about the three-hour-plus running time.

One big reason people see blockbuster films like the Avengers at the multiplex is to experience it as if you were there, fighting along with them, as you're enveloped by a massive screen.

The only drawback is, there is no convenient pause button if have to relieve yourself.

Got a catheter?

The internet is giving audiences with pea-sized bladders helpful tips on when to hit the urinals without missing a crucial moment, even though the movie is packed to the gills with many notable scenes.

A moviegoer sent out an S.O.S.

According to CNET, Endgame is the longest Marvel Studio film ever. People put together a spoiler-free guide to alert viewers on the best time to use the restroom after guzzling the tub of soda you just had to order at the concession stand.

The one crucial moment you should avoid leaving your seat is two-hours into the movie when apparently something monumental happens. Maybe that will be enough to make you wet your pants anyway, so we're all screwed.

You can sneak out when the San Francisco title card appears on the screen that heralds the Ant-Man segment about 30-minutes into the film.

If you lasted an hour into the film, the scene where Hulk is having lunch is a good time to go if you must. You will not miss anything in the next 10 to 15-minutes.

CNET gives you your last chance to pee when the New Jersey title card on the screen.

"There are no good spots to pee in the last hour of this film, sorry but we don't make the rules."

If you can't hold it, just take Paul Rudd's advice.

Or like I mentioned earlier, there's this:

Know before you go that you should take your sips wisely.

Be aware of consequences.

Other sites like Mashable contributed to the list.

At the 60-minute mark, someone asks Thor to explain the Aether, the Infinity Gauntlet's red stone. You'll only have about two-minues before the scene shifts.

You also have about five minutes to do your business after the word Asgard shows up 70-minutes into the movie.

Some people are just trained for this.

The power of suggestion is the strongest of all.

Most of the guides urge you to hold it once the climactic battle in the last hour begins.

Those who've seen the film say the momentum continues escalating to the point where you're reminded why you're paying top dollar to watch it on the big screen and not on Disney Plus, whenever that happens.

Your best bet is to leave all acts of streaming at home before hitting theaters.