The NHS recommends getting travel vaccination advice around 8 weeks before travelling. This gives enough time to assess your destination and complete vaccines that require multiple doses.
For rabies, the usual vaccination schedule is 3 doses over 28 days. In some circumstances, an alternative schedule may be used when there is not enough time before travel, but the appropriate schedule should be determined by a healthcare professional.
If you have an upcoming trip, take your itinerary and previous vaccination records to your travel health consultation. This allows the healthcare professional to consider your destination, activities and individual circumstances.