Hi!
In fact, the total rendering time using Lumen is 1 minute per frame, possibly 40 seconds. But you need to use not 10 frames for rendering, but for example your full sequence. Try to do tests and you will find that it is more profitable to render more frames than to make one or more frames.
Try check version 5.3?
As for rendering animation using Path Tracing mode. The Path Tracing technology in Engine 5.2 does not support vertex animation.(for example, animation of the material of trees, grass). But I didn 't check it in the version .5.3, perhaps there are some innovations in relation to the grass.