What does the log say about it? Looks like start time was off for several seconds each time, maybe that's why in the end Time Stretch was not applied at all.
apparently this is the case
[2025-04-13 10:47:12] TimeStretch: init
[2025-04-13 10:47:12] TimeStretch: speed change applied (6,67%)
[2025-04-13 10:49:09] TimeStretch: init
[2025-04-13 10:49:09] TimeStretch: speed change applied (4,77%)
[2025-04-13 10:51:25] TimeStretch: init
[2025-04-13 10:51:25] TimeStretch: speed change applied (5,91%)
[2025-04-13 10:54:18] TimeStretch: init
[2025-04-13 10:54:18] TimeStretch: speed change applied (5,38%)
[2025-04-13 10:54:24] TimeStretch: init
[2025-04-13 10:54:24] TimeStretch skipped: speed change (8,12%) is out of range
[2025-04-13 10:56:45] TimeStretch: init
[2025-04-13 10:56:45] TimeStretch skipped: hour start/end is not valid