Your lifespan is just 30 minutes from now, what will you do then?

sit down and just wait for it <3

Explanation:

if your lifespan is only for 30 more minutes unfortunately, you're a goner in a half an hour. rip dood:'(

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."