I have a schedule application with a changing number of "rows" objects in a schedule array that represents appointments (each day can have diffrent number of appointments).

I want to add to the schedule a red time mark that represents the current time in relationship to the ongoing appointemnt and updates every minute. The problem is that I need to put an intervel function in each row commponent (in order for the time mark to be fully reactive during the day, also each appointment can have diffrent duartion), which means that up to 50 intervals can be active at the same time.. how bad is it to have multiple active intervals? thanks!