There are a couple of key factors that can influence the time it takes to re-index changes to your Magento data:
- how often you re-index to Algolia,
- the number of items you are indexing.
Generally speaking, if you use the SKU re-indexing form those items will be indexed quickly. However, if you send a large number of changes to Algolia, those changes will take time to build. Due to varying factors its not possible provide an exact timeframe this will take and there is no guaranteed ETA.
To help with indexing speed, if you are using the indexing queue, make sure that it is configured to update at the correct rate required for your use case.