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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _graphql_query_waittime(self, query_hash: str, current_time: float, untracked_queries: bool = False) -> int: """Calculate time needed to wait before GraphQL query can be executed."""

        sliding_window = 660
        if query_hash not in self._graphql_query_timestamps:
            self._graphql_query_timestamps[query_hash] = []
        self._graphql_query_timestamps[query_hash] = list(filter(lambda t: t > current_time - 60 * 60,
                                                                 self._graphql_query_timestamps[query_hash]))
        reqs_in_sliding_window = list(filter(lambda t: t > current_time - sliding_window,
                                             self._graphql_query_timestamps[query_hash]))
        count_per_sliding_window = self._graphql_request_count_per_sliding_window(query_hash)
        if len(reqs_in_sliding_window) < count_per_sliding_window and not untracked_queries:
            return max(0, self._graphql_earliest_next_request_time - current_time)
        next_request_time = min(reqs_in_sliding_window) + sliding_window + 6
        if untracked_queries:
            self._graphql_earliest_next_request_time = next_request_time
        return round(max(next_request_time, self._graphql_earliest_next_request_time) - current_time)