Back when I was still working in a hotel, one of my main jobs in the afternoon was to send the invoices of all the guests that checked out during the day. I’d have to go through each account one by one, determine which folio to send, and ensure that I send it to the correct email address. The whole process would take about an hour and a half to finish, and I kept doing this job for a year and a half. By then, I was so good at sending invoices that I could do it within 30–45mins while effectively listening to an audiobook, or holding a conversation with a guest on the phone.
I know the feeling so well. The task completely blurs out of my cognition, and I could use my full attention to do whatever I please. It’s like playing the piano and singing at the same time, which is another form of multitasking.