There is no scientific evidence that black mallow infusion is effective in inducing menstruation, so it is impossible to determine how long it would take to achieve such an effect.

There are also no reliable, scientifically proven other home remedies to speed up menstruation. Although some herbs (such as black mallow, ginger and parsley) are traditionally used for this purpose, there is no evidence of their effectiveness.

If your period is late, you should rule out pregnancy, e.g. by taking a pregnancy test from the pharmacy: https://www.gdziepolek.pl/produkty/97388/pink-test-ciazowy-strumieniowy-super-czuly-domowe-laboratrium-test/apteki

It is also worth consulting a doctor to rule out other causes of hormonal disorders.

I have attached helpful materials:

https://www.gdziepolek.pl/kategorie/leki-na-zaburzenia-miesiaczkowania