That is a BIG time to cut down, and you must be patient, you are not going to cut your time down by that margian in a day,
But these, over a period of time should certainly help you out:
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High Intensity Shuttle Run
Pace out 30 meters on grass or a running track. Place a cone at the start and at 5 meter intervals (7 cones in total).
Sprint from the starting cone to 5 meter cone and back. Turn and sprint to 10 meter cone and back to start. Sprint to 15meter cone and back to start and so on until you sprint the full 30 meters and back.
Rest for 90 seconds and repeat. Complete a total of 6 sets keeping rest periods to 90 seconds.
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Pyramids
Pace out 50 meters placing a cone at the start and then at 10 meter intervals (6 cones in total).
Starting at the first cone sprint all out for 10 meters and walk the remaining 40 meters.
Turn and sprint 20 meters and walk for 30 meters.
Turn and sprint 30 meters and walk for 20 meters.
Turn and sprint 40 meters and walk for 10 meters. Finally...
Turn and sprint 50 meters and then turn and sprint 50 meters again back to the start.
This is classed as one set. Rest for 90 seconds and repeat for a total of 4 sets. Rest for a full 3 minutes and repeat.
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Cruise And Sprint
Mark out a distance of 100 meters. From the start gradually accelerate to reach full speed at about 60 meters. Sprint all out for the final 40 meters.
Slow down gradually, turn and repeat.
Continue for 2 minutes and then rest for 2 minutes. This is one set. Repeat for a total of 6 sets.
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There are many more but those are pretty good.
