Is there any restriction of sequence length to submit to DDBJ?

Upper limit

If the sequence is really observed, there is no upper limitation of the sequence length to submit to DDBJ.
However, we can not accept any operationally joined sequence, for example, joining chromosomes. We accept each chromosome sequence, respectively.
For whole genome scale sequences, submit by using Mass Submission System (MSS) instead of Nucleotide Sequence Submission System (NSSS).
See Workflow of the data submission to DDBJ

Lower limit

Since June 2021, when the sequence is less than 100 bp in its length, we will refuse the sequence data submission.

References

Is there any case to reject submission to DDBJ?

Acceptable data for DDBJ

Not acceptable sequences