[chucksta]

No they used "only" as in "not very long". The question is asking how can you say it's not very long when the covid vaccination lasts less than a year in comparison

[ben_w]

6 months is pretty short in both cases, but I think darkcha0s has me right, the cost is much lower in the vaccination case.

For a much most positive example of how that matters:

“How long did he retire for?“ “Only six months“

vs.

“How long did he go on holiday for?“ “Only six months“