HI, I have been working with similar task for last 13 years in my previous organizations, some of my responsibility was maintaining the google sheets per customer (there were more than 30 customers) for each of there task and billing for the task completed (average 1500 entries per day) with 100% accuracy. I have won many awards and recognitions from my previous employers for my dedication, hard work, details, and accuracy.
I have turned to a full-time freelancer now and available for more full 8 hours day work (and if required I can work more hours).
Please ping me to discuss more and if needed I can provide you with some sample of my work.