You should read "Making Comics" by Scott McCloud. He talks a lot about this stuff.
I'm going to show some techniques that don't involve using words at all. Time manipulation is a really core part of being a great comics creator. You should definitely read some comics by Kiyohiko Azuma or Bryan Lee O'Malley to study this, because both of them have incredible mastery of panel timing.
So, our scenario is, "Bob grabs a can of coke and drinks it."
First example, very fast, we have two small panels. He grabs it, he drinks it.

Okay, now let's add in an extra panel where he reaches for it...then grabs it and drinks it.

Okay, cool, so that slowed things down, adding almost a hesitation or a sense of buildup to that action, and also pulling in on Bob for the drinking part, like we're really focusing in on that moment and lingering on it, slowed things down.
Now... what if, instead of adding more panels... we lengthen the panel where Bob reaches, and have his hand way over at the other side of the panel, as though it has longer to go to reach the cola?

Oho! That slowed things down even more!
...What other techniques could we use? All right. Let's add Alice. Alice is here to react to Bob reaching for and drinking the coke! Now let's slow this baby down to a crawl!

So in this one, we get a shot of the coke can in detail, because detail slows things down. Then we see Bob seeing the delicious cola, creating anticipation. We see him reach for it slowly across a long panel...and there's Alice looking on. We see her anticipation. We see Bob grab the can and Alice is pissed. We pull in on Bob taking a sip, lingering on it, then we pull out for a long, agonising panel where the glugs cross the space, and the glugs continue, drawing out that moment as we pull in on Alice's building anger.
So we're using more panels to really draw out the scene, but by having all the shots be different aspects of the scene, it removes the repetition. We use detail in shots to make the reader slow down to consider them more, we use longer panels, and put things further away from each other in panels to create distance that must be travelled, giving a sense of inertia.
Hope that's helpful!