def cache_with_duration(duration=(60 * 60)):  # Default duration is 1 hour
    import datetime, functools
    def decorator(func):
        cache = {}
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            now = datetime.datetime.now()
            if args not in cache or (now - cache[args]['time']).total_seconds() > duration:
                result = func(*args, **kwargs)
                cache[args] = {'result': result, 'time': now}
            return cache[args]['result']
        return wrapper
    return decorator

@cache_with_duration(duration=3)
def cache_with_duration_example():
    import datetime
    now = datetime.datetime.now()
    return f"Current time is: {now.strftime('%Y-%m-%d %H:%M:%S')}" # this will only update every 3 seconds

cache_with_duration_example()