QB Issue Resolution:

The estimate number field has been expanded in 2015 to be 20 characters – prior to that it was 11 characters.

Resolution for Issue 'How many characters can we insert to a header field in an estimates?' available: Yes (Solved).
Source: Intuit Community forum.

How many characters can we insert to a header field in an estimates?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Estimates
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Error Recovery for Estimates [Canada]
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