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While I was looking for a way to convert an rclpy.Duration object to it's equivalent in seconds, I came across this OP from ROS-Answers: https://answers.ros.org/question/415959/is-there-a-more-elegant-way-to-get-the-time-in-seconds-in-a-ros-2-node/

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It seems that the rclpy.Duration() object only has a nanoseconds API. However, to get seconds from an rclpy.Duration() object, we can leverage the to_msg() API from rclpy.Duration() and then use the sec interface like so:

import rclpy

node = rclpy.create_node("my_node")
t1 = node.get_clock().now()
# Do something here that takes some time.
t2 = node.get_clock().now()
time_diff_in_sec = (t2 - t1).to_msg().sec
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