how often do scovys lay?

i was wondering how often muscovys lay. is it once a week? twice a week..few times a month or??

i ask because i have 2 ladies, both been laying since around 24weeks old (they are now about 32 weeks) but their laying seems strange.

there will be nothing for two weeks, then 2 appear on the same day, 2 the next day, then nothing again for weeks...now is it because they are still youngish...or?? im guessing they cant lay two eggs in 24hrs so it must be them both laying on the same days but why lay for two consecutive days then nothing for a long time??