Long-time travel outside the US can affect the residency requirement for citizenship. If you stay away more than 6 months but less than a year, I'm not sure, but if you leave more than a year, it is very likely, unless you get a re-entry permit to keep your residency.

It can affect residency status

If an applicant is absent from the United States for a period of more than six months but less than one year, there will be a presumption that they disrupted their continuous residence. This includes any absence that takes place prior to filing the naturalization application and before admission as a U.S. citizen. The applicant will have to demonstrate proof of residence. In other words, the person will have to show that they did not abandon residence in the U.S. and that the U.S. is their primary place of residence.

An absence from the United States for a period of one year or more during the period for which continuous residence is required will break the continuous residence requirement. Again, the applicable period includes time prior to and after filing the naturalization application.