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# Late Span finish example.
This example shows a `Span` for a top-level operation, with independent, unknown lifetime, acting as parent of a few asynchronous subtasks (which must re-activate it but not finish it).
```python
# Fire away a few subtasks, passing a parent Span whose lifetime
# is not tied at all to the children.
def submit_subtasks(self, parent_span):
def task(name, interval):
with self.tracer.scope_manager.activate(parent_span, False):
with self.tracer.start_active_span(name):
time.sleep(interval)
self.executor.submit(task, 'task1', 0.1)
self.executor.submit(task, 'task2', 0.3)
```
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