Complete the pattern

I have often wondered how people come up with puzzle questions.  They must have to be really smart to figure them out.  I was thinking about this one night, while drifting off to sleep, and I came up with the following puzzle question of my own.  I don’t know how easy or hard it is, but here it is.  Complete the pattern:

10:10 10:11 10:12 10:13 10:15
10:10 10:11 10:15 10:13 ?

What time should appear in the last box?  Put you answer in the comments and your reason why, and I will let you know if it the same reason I came up with for my answer.

Published by Jamie Todd Rubin

Jamie Todd Rubin writes fiction and nonfiction for a variety of publications including Analog, Clarkesworld, The Daily Beast, 99U, Daily Science Fiction, Lightspeed, InterGalactic Medicine Show, and several anthologies. He was featured in Lifehacker’s How I Work series. He has been blogging since 2005. By day, he manages software projects and occasionally writes code. He lives in Falls Church, Virginia with his wife and three children. Find him on Twitter at @jamietr.