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Execution Limits

  • Flow Execution Time
    Maximum: 600 seconds (10 minutes)
    Flows exceeding this limit will be marked as timed out.
  • Memory Usage
    Maximum: 1 GB RAM
    (Self hosted can be configured via FLO_SANDBOX_MEMORY_LIMIT)
The memory usage is measured for the entire Node.js process running the flow. There is approximately 300 MB of overhead for a warm process with hubs already loaded.
Note 1: Flows paused by steps like Wait for Approval or Delay do not count toward the 600-second limit.
Note 2: To handle longer processes, split them into multiple flows.
For example:
  • Have one flow call another via webhook.
  • Process smaller batches of items in separate flows.

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File Storage Limits

Files from actions or triggers are stored in the database/S3 to support retries for certain steps.
  • Maximum File Size: 10 MB
    (Configurable via FLO_MAX_FILE_SIZE_MB, default: 4 MB)

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Key / Value Storage Limits

Some hubs use the built-in FLO key store (e.g., Store Hub, Queue Hub).
  • Maximum Key Length: 128 characters
  • Maximum Value Size: 512 KB