Doesn't even have to be the case. A 2min task done every (work)day, takes up a bit over 7 hours/year. After 2½ years it will be a benefit to have automated it!
Only if the requirements stay the same for 2.5 years. Otherwise there's probably another week of time trying to update the initial work, then just throwing it away and making a new solution that's theoretically easier to update.
If changing requirements mean you need to update the script, then updating the script is part of your job. QED. I don't see the problem with a little job security.