SharePoint Microsoft 365 Continuous Crawl schedule for Search

Hi @Shatabdi Chatterjee

Since the data of SharePoint online is hosted in the cloud, we cannot manually control the trigger time of the scheduled task.

If you have business needs and need to execute crawl immediately, you can contact Microsoft's engineers to help you execute it immediately in the background.

Ways to contact support for business products - Admin Help

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The search infra of M365 differs quite a bit from on-prem as search is driven by Microsoft Search. No you don't have access to those settings and there is no SLA regarding Search, but in general the crawls complete within <60 seconds for new/modified/deleted items.