Is there a reason this script does not iterate over dates in larger chunks?

[ssolidus]

Wouldn't this script be a lot faster if it loaded by chunks of weeks or months rather than everyday?

e.g.

Current behaviour:

• 2018-01-01 to 2018-01-02
• 2018-01-02 to 2018-01-03

Potentially better behaviour:

• 2018-01-01 to 2018-01-10
• 2018-01-10 to 2018-01-20