How to calculate optimum time to complete job?

I need to know how to calculate optimum time to complete specific job.
Is there a way to decide/calculate time for specific task.
As a example say data entering job, bot has to navigate 3 pages and insert line item in invoice, need to enter 3 fields , item name, qty, unit price and click on save button.
so we have 10 line items per invoice and there is 10 invoices to enter data.

Is there standard way to calculate time for this job, if there is a way then we measure our process according to that time.

You can use Orchestrator Queues. The time for each transaction will be shown in it. You will also get to view the average time of all transactions processed till now.