When I add a credit card, what is the amount debited or charged to the card "which is usually done in 24-48 hours"?
If you open a ticket and ask us to charge your card now we can do so.
But I added today and have only $ 2 credit in DgitalOcean ... Can I use this card this month (April), for example tomorrow, to increase my credit?
There are no deductions from your account when you add a credit card.
Your first charge will appear at the end of the month for the usage of virtual servers for that month.
You won't be notified about changes to this idea.