There are no UK absence limits for Spouse visas, however, any absences of more than 6 months must be declared and explained on the application form when applying for ILR. Furthermore, if your wife's leave to remain as a Spouse was granted under Appendix FM, it is a requirement of this visa that you intend to live together permanently in the UK, and must provide evidence in extension and ILR applications that since the last grant of limited leave to remain as a partner, you have lived together in the UK or there is good reason, consistent with a continuing intention to live together permanently in the UK, for any period in which you have not done so.
In view of any future Citizenship application, you should also be aware that she must:
- have been resident in the UK for 3 years before the date of application;
- have been physically present in the UK exactly 3 years before the date of application;
- not have been absent from the UK for more than 270 days in the 3 year period.
Under previous legislation, if PBS dependant leave was granted before 9 July 2012, applicants could qualify for ILR by switching into Part 8 and completing a 2 year period as a partner. Your wife's eligibility for ILR would depend on which rules her visa was granted under, which would need to be checked.