subround block time left check

[ssd04]

Reasoning behind the pull request

Proposed changes

Testing procedure

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.58%. Comparing base (5ddf1b8) to head (d92eb77).

Additional details and impacted files

@@                 Coverage Diff                 @@
##           feat/testnet-fixes    #7870   +/-   ##
===================================================
  Coverage               77.57%   77.58%           
===================================================
  Files                     884      884           
  Lines                  125265   125274    +9     
===================================================
+ Hits                    97171    97188   +17     
+ Misses                  21643    21637    -6     
+ Partials                 6451     6449    -2     

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