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# Timeout Management
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Timeout decorators and utilities for managing operation deadlines with various timeout strategies including constant, exponential, and deadline-based timeouts.
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## Capabilities
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### Timeout Classes
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```python { .api }
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class TimeToDeadlineTimeout:
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    """
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    Timeout that calculates remaining time to a fixed deadline.
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    Args:
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        deadline (float): Absolute deadline timestamp
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    """
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    def __init__(self, deadline): ...
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    def __call__(self, func): ...
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class ConstantTimeout:
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    """
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    Deprecated: Constant timeout for each retry attempt.
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    Args:
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        timeout (float): Timeout duration in seconds
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    """
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    def __init__(self, timeout): ...
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class ExponentialTimeout:
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    """
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    Deprecated: Exponentially increasing timeout.
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    Args:
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        initial_timeout (float): Initial timeout
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        max_timeout (float): Maximum timeout
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        multiplier (float): Timeout multiplier
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    """
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    def __init__(self, initial_timeout, max_timeout, multiplier): ...
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```
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## Usage Examples
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```python
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from google.api_core import timeout
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import time
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# Deadline-based timeout
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deadline_timeout = timeout.TimeToDeadlineTimeout(deadline=time.time() + 30)
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@deadline_timeout
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def operation_with_deadline():
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    # Operation must complete within deadline
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    time.sleep(10)
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    return "completed"
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```