hi my name is Nugroho freelance worker from indonesia, my daily work is removing the background. for the example you gave, I can complete it in 3-5 minutes, you can check in my video at the following link.
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I use Wacom, shortcuts, pen tools. allows work to be done quickly and cleanly, I guarantee you will not lose paying me, if you ask how much in 1 hour I can finish your work, you can count it. 12-25 pictures, and I work 6-12 hours a day, if you want to consult, don't hesitate to contact, I will be happy to help you. of course I also hope this job will be mine.
for some other jobs my client uploads thousands of files via dropbox, google drive, or via FTP
thank you
Nugroho