How many max kernel timers can run concurrently?

Hi All, I am trying to implement a timer based stats notification for running UDP streams. Mostly a timer per UDP session will send UDP statistics to userspace via netlink. I would like to know, 1. How many max number of kernel timers I can run simultaneously? I've max 40K UDP sessions. 2. Will there be any performance impact when max number of timers are ticking? -- ~ Swapnil