A friend has asked about this and so far most seem to believe the best answer is:
At the end of an eight- to ten-week project period, the team reports their findings and recommendations to their client.
Would this be the correct way to hyphenate the sentence? Do you even need hyphens or can it be an open-compound?
When should compound words be written as one word, with hyphens, or with spaces?
Indicates that this could be an open compound since it only mentions past-participles or prefixes.