Just looking for a guess. I only casually participate in yearly events, so I'm not sure how long they usually last.

it is not certain. I was thinking that since Skitters accepted stage 3 of the infection, that the event would be over soon and it'd be only a week. But I have progressed to stage 4 so if it goes to 6 or 7 stages, and allowing for folks to take awhile to decide to drink the vial, it may last as long as two weeks altogether.

From the subetapedia:

Thank you! I checked Subeta Wiki, but didn't think to check Subetapedia. I appreciate it!

you are welcome. The Subetapedia articles are good date approximations if nothing unusual happens. This event is still unfoldings so who knows where it will go, but if you're planning that's what to aim for.