How can I show the elapsed time and how can I round up those 2: 15 to 3 hours

[Kal_Lam]

@gwen1805, you could also have a look at this post discussed previously (which should help you solve your issue):

Calculate length of interview with start/end timestamps

Regarding your first query: Maybe this post discussed previously should help you solve your first query: Regarding your second query: Maybe this post discussed previously should help you calculate your survey time: and this post too …