Honestly one day of anything probably wouldn't bother me cause everything would be new initially I'd know it was ending so I shouldn't get bored.
Driving a city bus
Prolly get sick of traffic being in the city but I love driving large vehicles so I'd enjoy it as long as I wasn't too far behind schedule or had to deal with aggression in passengers.
Interviewing on the telephone
If my calls were bothering other people or the questions were boring and uninteresting then I wouldn't like it, if not I'd enjoy getting different reactions out of different people.
Cleaning an office building
I'd be ok with that for a day. I don't love cleaning but have helped out a friend in that capacity before, I'm a bit of a perfectionist and get a sense of accomplishment in a job well done.
Keeping inventory of a storage hall
I'd be cool with that. I'd prolly slack off though.
Offering product samples in the mall
Sounds like heaps of fun. Samples would be great, selling them would be another story.
Filling candy machines
One for you, one for me, one for you, one for...
Writing data from papers to a database
I'd be cool with that, I don't mind doing methodical things cause it means I can shut my brain off and go elsewhere.
Assembling simple products
I'd be cool with that. I'd challenge myself to get better and better each one I made, then have absolutely no desire to do it ever again.