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Best case, with 10-10 through 5-5, you hit a straight 0.56% of the time.
With J-J and 4-4, 0.44%; with Q-Q and 3-3, 0.33%; and with A-A, K-K, and 2-2, 0.22%. Not very good odds.
Here's my math (please check this, if you like).
For pocket pair XX, where X is between 10 and 5, inclusive:
You can make the following straights:
X, X+1, X+2, X+3, X+4 (e.g. 10-J-Q-K-A or 5-6-7-8-9)
X-1, X, X+1, X+2, X+3
X-2, X-1, X, X+1, X+2
X-3, X-2, X-1, X, X+1
X-4, X-3, X-2, X-1, X (e.g. 6-7-8-9-10 or A-2-3-4-5)
So, there are 5 ways that are equally probable.
The probability of making any single one of these is:
16 / 50 * 12 / 49 * 8 / 48 * 4 / 47 = 0.11%
So the probability of making any of them is:
16 / 50 * 12 / 49 * 8 / 48 * 4 / 47 * 5 = 0.56%
Since there are fewer straights to be made for pocket pairs outside of 10-10 through 5-5, the odds go down for those.
I hope this answered your question.
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