# Return block duration

``

    block_duration   ()

Given a block, runs it and returns the amount of time that has passed. This time is in seconds and is not scaled to the current BPM. Any threads spawned in the block are not accounted for.

Introduced in v2.9

## Examples

# Example 1
``
    dur = block_duration do
      play 50
      sleep 1
      play 62
      sleep 2
    end

    puts dur
| ``
    #=> Returns 3 as 3 seconds have passed within the block
# Example 2
``
    use_bpm 120
    dur = block_duration do
      play 50
      sleep 1
      play 62
      sleep 2
    end

    puts dur
| ``
    #=> Returns 1.5 as 1.5 seconds have passed within the block
    #   (due to the BPM being 120)