Meta-descriptions don’t count towards your SEO, so don’t worry about their length. The only effect the length of your meta-descriptions can have is that part of it will not be visible on all devices (if they are too long), but there is no punishment from having them too long.
Pro Tip: Make sure they are never the same on any 2 pages of your site. If they are, there is a risk Google will consider the content of the pages to also be the same and simply exclude one of the pages from their index. Nothing could be worse for your SEO than that.