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It depends on which one you are referring to as there were 10 tornadoes in Montana in 2010. The two most notable are:

The Billings EF2 of June 20, which lasted 12 minutes and

The Sheridan County EF3 of July 26 which lasted 37 minutes (this was Montana's only killer tornado for the year).

The 8 others lasted as follows:

The McCone County EF0 of May 27 which lasted 15 seconds

The Carbon County EF2 of June 16 which lasted 5 minutes

The McCone County EF1 of June 16 which lasted 8 minutes

The Valley County EF0 of June 21 which lasted less than a minute

The Otter area EF1 of June 21 which lasted 10 minutes

The Powder River County EF2 of June 21 which lasted 10 minutes

The Park County EF2 of July 2 which lasted 7 minutes

The Wheat land County EF0 of September 9 which lasted 5 minutes

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Q: How long did the Montana tornado 2010 last?
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