The D2 visa is a multiple-entry business visa valid for 1, 2 or 5 years. During this time, you can enter and leave Indonesia as often as you like for business purposes, e.g. meetings, negotiations or trade fairs.
Each entry gives you a 60-day stay, which you can extend twice by 60 days each, up to 180 days. You apply fully online and receive the visa as an e-visa by email.