Add functions to restaurant app.

We have an APK developed by another freelancer a few years ago. We have the source code. The app works like this; In our kitchen we have a big screen TV with the "waiter login". Our staff who serves the table uses Android Tablets to punch in the orders "table mode". The orders appear on the big screen tv in the kitchen. Now we need to add a few features and fix one known bug. The features we are looking to add are; A) - Wait time. If the system has more than 2 orders in line, I want the APK to count 8 minutes per order as "wait time". So if there is 4 order total, the 2 first does not count, but 3 and 4 add together to 16 minutes wait time. This wait time should appear in two ways; 1st - I want to pull it up on a big screen 2nd - It should show in the order system before the waiter starts with a new order. Bugs to fix; A) Waitersystem - When clicking “order done”, please add a “thinking watch” until the specific table/order is finished processing. Sometimes the staff are too quick to click “process” and accidently click the next one to. So, a thinking watch that revolves until the process is done, preventing the staff from pushing on the next order. B) Issues: This problem occurs when you want to change an order, the system still send the original order to the waiter system, even though you deleted and made changes. See description below. Time: 10.23 (local Swedish time) I made an order as following; 5 coca cola 1 136:an 2 byxelkrok  Then I went into view mode. I deleted 2 byxelkrok. Then changed to; 5 coca cola 1 136:an 1 Byxelkrok 1 Bysklunden  Went to view order again and it shows; 5 coca cola 1 136:an 1 Byxelkrok 1 Bysklunden Which is correct. BUT!  When I look in the waiter system it shows; 5 coca cola 1 136:an 2 Byxelkrok (This one I deleted, but it still shows it in waiter system, but not in order view) 1 Bysklunden