Not a very scientific test, but worthy of posting anyway...
I first ran the iPP 10.5 down to 5%, and charged up with the 29W charging block and 1 meter USB-C to Lightning cable.
These numbers are with the screen off, only turning on to check the progress.
0 min - 5%
23 min - 30%
40 min - 43%
55 min - 56%
67 min - 66%
77 min - 74%
90 min - 83%
100 min - 88%
110 min - 93%
120 min - 96%
130 min - 98%
135 min - 99%
144 min - 100%
I first ran the iPP 10.5 down to 5%, and charged up with the 29W charging block and 1 meter USB-C to Lightning cable.
These numbers are with the screen off, only turning on to check the progress.
0 min - 5%
23 min - 30%
40 min - 43%
55 min - 56%
67 min - 66%
77 min - 74%
90 min - 83%
100 min - 88%
110 min - 93%
120 min - 96%
130 min - 98%
135 min - 99%
144 min - 100%