For the seventh time.

Question

my reply For the seventh time, I'm not giving you the answer.

The rainbow stretched across the sky from the ice cream truck to the house down the lane.
my reply The rainbow stretched across the sky, from the ice cream truck, to the house down the lane.

The rainbow stretched across the sky, from the ice cream truck, to the house down the lane.

In this sentence, I don't believe that any commas are needed.

See the site below. Look particularly at the example with multiple prep. phs.

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I agree with GuruBlue. No commas needed.