Extending a Running Plan ( 10-K into a 15 K)

   Okay, I am week 5 finished session 1 and have session 2 tomorrow or Wednesday (WX dependent).  As you can see this is a basic "time" plan 3 runs a week, with the hard run, the easy run and then the medium run ( Goldie Locks would be SO proud) with an easier "rest and recovery week every 4th week.   In January there is a local 5 K / 15 K.  I would really like to do the 15 K. How would I continue the below plan to be ready for the 15K? Say I add 3 weeks, and make this into a 16 week plan, what times would I bump up to over the final 3 weeks?

                                 13-Week Plan 

This is the 13-week training plan to run 10 km. The times listed are for the exercise itself, but you must also do 5 minutes of warm up followed by some stretches, and 5 minutes of cool down at the end.

Week 1

Session 1 (36 minutes)
Run 1 minute. Walk 2 minutes. Do 12 times.

Session 2 (27 minutes)
Run 1 minute. Walk 2 minutes. Do 9 times.

Session 3 (33 minutes)
Run 1 minute. Walk 2 minutes. Do 11 times.

Week 2

Session 1 (44 minutes)
Run 2 minutes. Walk 2 minutes. Do 11 times.

Session 2 (30 minutes)
Run 1 minute. Walk 2 minutes. Do 10 times.

Session 3 (40 minutes)
Run 2 minutes. Walk 2 minutes. Do 10 times.

Week 3

Session 1 (50 minutes)
Run 3 minutes. Walk 2 minutes. Do 10 times.

Session 2 (36 minutes)
Run 2 minutes. Walk 2 minutes. Do 9 times.

Session 3 (45 minutes)
Run 3 minutes. Walk 2 minutes. Do 9 times.

Week 4 - Easy Recovery Week

Session 1 (40 minutes)
Run 3 minutes. Walk 2 minutes. Do 8 times.

Session 2 (28 minutes)
Run 2 minutes. Walk 2 minutes. Do 7 times.

Session 3 (35 minutes)
Run 2 minutes. Walk 3 minutes. Do 7 times.

Week 5

Session 1 (40 minutes)
Run 3 minutes. Walk 1 minute. Do 10 times.

Session 2 (30 minutes)
Run 2 minutes. Walk 1 minute. Do 10 times.

Session 3 (36 minutes)
Run 3 minutes. Walk 1 minute. Do 9 times.

Week 6

Session 1 (48 minutes)
Run 5 minutes. Walk 1 minute. Do 8 times.

Session 2 (36 minutes)
Run 2 minutes. Walk 1 minute. Do 12 times.

Session 3 (40 minutes)
Run 3 minutes. Walk 1 minute. Do 10 times.

Week 7

Session 1 (55 minutes)
Run 10 minutes. Walk 1 minute. Do 5 times.

Session 2 (40 minutes)
Run 3 minutes. Walk 1 minute. Do 10 times.

Session 3 (48 minutes)
Run 5 minutes. Walk 1 minute. Do 8 times.

Week 8 - Easy Recovery Week

Session 1 (44 minutes)
Run 10 minutes. Walk 1 minute. Do 4 times.

Session 2 (32 minutes)
Run 3 minutes. Walk 1 minute. Do 8 times.

Session 3 (42 minutes)
Run 5 minutes. Walk 1 minute. Do 7 times.

Week 9

Session 1 (58 minutes)
Run 10 minutes. Walk 1 minute. Run 20 minutes. Walk 1 minute. Run 15 minutes. Walk 1 minute. Run 10 minutes.

Session 2 (44 minutes)
Run 10 minutes. Walk 1 minute. Do 4 times.

Session 3 (48 minutes)
Run 15 minutes. Walk 1 minute. Do 3 times.

Week 10

Session 1 (61 minutes)
Run 30 minutes. Walk 1 minute. Run 30 minutes.

Session 2 (44 minutes)
Run 10 minutes. Walk 1 minute. Do 4 times.

Session 3 (47 minutes)
Run 20 minutes. Walk 1 minute. Run 15 minutes. Walk 1 minute. Run 10 minutes.

Week 11

Session 1 (61 minutes)
Run 40 minutes. Walk 1 minute. Run 20 minutes.

Session 2 (44 minutes)
Run 10 minutes. Walk 1 minute. Do 4 times.

Session 3 (47 minutes)
Run 20 minutes. Walk 1 minute. Run 15 minutes. Walk 1 minute. Run 10 minutes.

Week 12 - Easy Week

Session 1 (50 minutes)
Run 50 minutes.

Session 2 (33 minutes)
Run 10 minutes. Walk 1 minute. Do 3 times.

Session 3 (42 minutes)
Run 15 minutes. Walk 1 minute. Run 15 minutes. Walk 1 minute. Run 10 minutes.

Week 13

Session 1 (40 minutes)
Run 40 minutes.

Session 2 (33 minutes)
Run 10 minutes. Walk 1 minute. Do 3 times.

Session 3
Run 10km!