Ability to have more than 20 lines on an invoice csv upload

Feature requested
Ability to have more than 20 lines on an invoice csv upload

Typical use case
I have around 30 clients and I might do 30 jobs for them in a month, which have to be billed on a line by line basis, with the job type and property address.

How I would expect it to work
I would expect it to work exactly as it does now but allow me to have more than 20 lines on an uploaded invoice.