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I just add a second sheet that is basically a copy & paste invoice. By the 2nd or 3rd invoice it hardly took me more than a minute.

I once integrated IFTTT with google sheets to automatically add a line to a spreadsheet when I entered and exited work. And then made some more pages in the sheet in order to have it all neat and orderly for timekeeping. A huge advantage was that I could correct small mistakes whenever I wanted, so it didn't matter much if the integration itself was a bit spotty.

With a few intermediate sheets and FILTER, UNIQUE, SUMIFS, and VLOOKUP, you can have it generate invoices too.

I use SUMIF at least. But i paste the totals in word processor docs.

It's my 1st of the month morning coffee ritual. Pretty good for morale.

A word document with an embedded excel table (or equivalent in any other office suite) works well enough.

If you faff around with macros for a bit, it can generate invoices too :)

This is what I've always done. Spreadsheets do everything I need.