How to limit wordpress the_excerpt() dynamically

I’m trying to limit WordPress post excerpt and I’ve tried some ways to do it but all of them was not the stuff that I need, to say concisely I want to limit post excerpt with a number that I use everywhere with differences.

For example, I need to make something I use it like this:
<?php the_excerpt('30') ?>
with this part of the code, I wanna limit my excerpt to 30 chars and in another place, I wanna use a different value like:
<?php the_excerpt('150') ?>
Is it in WordPress?