During import you will find errors about the limitations of certain variable types. Here is a summary:

- The limit for Open Numeric is 18 digits and then 10 decimals
- The limit for a Respondent Number is 99 999 999 999 999 (as a number, 14 digits)
- The limit for a Categorised Value for a Single Response question is 10 digits.

You can find here for more information about the characteristics for specific variables to import.