It creates real risk. Permanent residence assumes actual residence in the United States, and long or repeated absences can raise abandonment questions that affect the whole family.
The residence question deserves advice before the capital moves
Conditional permanent residence is permanent residence with conditions attached, and the underlying expectation is that the person lives in the United States. Employment that keeps someone outside the country for extended rotations, with a home and family base elsewhere, is the pattern most likely to attract scrutiny on return. There are mechanisms addressing extended absence, and their availability and effect depend on individual circumstances, so this is a question to put to a lawyer with the actual rotation schedule in front of them rather than to resolve by assumption.
Two practical points follow. First, decide who in the household will genuinely relocate and when, because the answer may differ between spouses. Second, understand that this affects derivatives too, since the children's status flows from the parents'.
A plan that treats residence as a formality is the plan most likely to fail late.