I made 10 different worlds on all platforms (infinite, creative) and made the necessary conditions for pillager patrols to spawn. Here are the results (all 1.18.12)
| Windows 10 | Android 6 | Android 8 | |
|---|---|---|---|
| world 1 | yes (2 hrs) | no | no |
| world 2 | no | no | no |
| world 3 | yes (1.5 hrs) | no | yes (20 mins) |
| world 4 | no | no | no |
| world 5 | yes (30-40 mins) | no | no |
| world 6 | no | no | no |
| world 7 | no | no | yes (45 mins) |
| world 8 | no | yes (1 hr) | yes (2 hrs 10 mins) |
| world 9 | yes (~1 hr) | didn't record for this one | no |
| world 10 | no | no | yes (2 hrs) |
I afked for just about 3 hrs in each world. It took me around a week to record these results.
(Can't provide any files for this)