KMail auto-archiving

Hello list,

How can I influence the time of day at which KMail does its automatic archiving 
of folders? I've tried setting it going in the middle of the night, but still 
it runs in mid-morning, while I'm using KMail. It seems to me that there 
should be a good chance of making an inconsistent archive if it does that.

-- 
Regards,
Peter.

Gentoo stable system, openrc-0.41.1
gcc 9.2.0, sys-kernel/gentoo-sources 5.4.28
QT 5.14.1, KDE frameworks 5.67.0, KDE plasma 5.17.5
KDE apps 19.12.3 incl KMail 19.12.3 (5.13.3), akonadi 19.08.3
dev-db/mariadb-10.2.29, net-libs/webkit-gtk-2.24.2
x11-drivers/xf86-video-amdgpu 19.0.1
dev-libs/amdgpu-pro-opencl-19.30.838629