How long does the show money need to be in my account for a visa application in Jakarta?

Hi all! how long does the show money have to be in the account for, when you apply in Jakarta? I’m a 21 year old foreign student in Singapore, my family stores our money through a friend’s bank account and in turn he sends me my monthly budget. Basically my father doesn’t just let me have tens of thousands of cash laying in my bank account.

But I’ll have to adjust accordingly and store it in advance if I need to. Hope someone can clear this up for me, thanks!