Hey Boris,
The length for meta data remains still the same. However, there can be a reason why your data have been truncated.
Google has a freedom to choose whatever text it wants based on the user's query. That means that if Google thinks there's is a better text for, let's say, meta description, than this text would be chosen from your page content.
Also, Google can compose the description from more pieces of the content so there can be those three dots "..." not only at the end but also in the middle of the description. That doesn't need to mean that it has been truncated but that there's basically no more relevant content on the page which would better match the user's query / intent.
Hope it makes sense. Ready for other questions. Cheers, Martin