Thier break from working facilities for others is mostly likely to be while sleeping overnight for at least 8 hours, so they are not playing at all during that time.
You need to have a MINIMUM 8 hour break from working ALL farmers facilities. The 8 hour break means DO NOT work facilities at all for anyone, during that time!!! It does not matter if you worked some facilities for some farmers but not all of them before taking that 8 hour break!!
10 AM Exactly down to the second, you stop working ALL facilities for ALL farmers. AFTER 6 PM you will be able to work ALL of your Neighbour an Buddies facilities, INCLUDING the ones you worked before 10 AM. If you are only one second too early you will reset the timers and will NOT be able to rework facilites!!!
Always reload your game before you want to rework facilities and check the Show Times information! The Timers are listed in a tool called Show Times that is located in your Toolbox. Click on your yellow toolbox to open it. Look in the 2nd column from the left and click on the Show Times icon (looks like a clock) to open it. There are 3 sections to Show Times. Make sure the Gamewide section has an Orange background. If it is brown click on Gamewide and the background of that sections name will turn Orange to indicate that is the section you are viewing. There is a timer for Regular Facilities. A green check mark here, means you can rework Regular Facilities. There is another timer for Service Facilities. A green check mark here, means you can rework Service Facilities. To be 100% sure that you can work ALL facilities the next day OR rework any facilities when working them twice a day, you need to see a green check mark for Rework Facilities AND for Rework Service Facilities. ONLY when you see the green check marks can you work or rework ALL types of facilities for any farmer that you have a connection in game with as a Neighbour or as a Buddy. If there are no green check marks, the time showing next to each of those types of facilites will help you know how much longer you need to wait. You can mouseover the times to see more information. This example shows roughly another 5 hours to wait. The timers will be more accurate when the time left to wait is under 1 hour. This example shows only part of a black circle so is less than one hour. In this case it's about 44 minutes. If you mouseover the icon it will show you the minutes.