Java EE 7 Timer Service Performance on Glassfish 4.1

In my project I have to read date from a number of devices using modbus/ethernet but the user has to configure at what time he/she wants the system to do the reading. So I was thinkig about using Timer Service to programatically create a timer every time the user adds a reading configuration. The problem is that the user can configure as many "timers" as he/she wants. So my question is, would this approach affect the application server performance? I'm using Glassfish 4.1, java 8 and java EE 7.