I've ordered pelargonium seeds from South-Africa. I don't know yet the time span for all the seeds to germinate, but two to three weeks after sowing, just a third has sprouted. The ones which sprouted were P. capitatum and P. Quercifolium.
P. Vitifolium has not sprouted yet.

Before reporting to the seller, I would like to consider the effects of crossing the equator, as the north and southern hemisphere have opposite seasons and seed dormancy is therefore disrupted:

Many seeds will require a dormancy period during the dry season. I have sown Pelargonium seeds raised from my own collection. Those which were sown in autumn have sprouted, those which I sowed in the spring did not. On the other hand, the Pelargonium seeds which I ordered from South-Africa were received in late summer, when in south-Africa that was almost spring time: past the dormancy period, so the seeds are now timed for spring.
Did that issue matter?