الحج is واجب once. Repeat الحج is جائز but contemporary scholars debate its advisability when millions await their first opportunity.
الحج is واجب once in a lifetime. Additional الحج is voluntary (nafl) and carries significant reward. النبي was asked about performing الحج every year and indicated it is meritorious but not required.
However, with millions waiting for their first الحج, many scholars argue repeat الحجاج should give way to first-timers. المملكة العربية السعودية now officially prioritizes first-time applicants, and some countries restrict repeat applications within five years.
A balanced approach: if your repeat الحج does not deprive another Muslim of their first opportunity and your finances allow it, voluntary الحج is blessed. But yielding your slot to a first-timer may carry even greater reward.
Source: ابن قدامة, Al-Mughni; International Islamic Fiqh Academy