You should be fine. You also have a 15 minute grace period at the end of your FP+ window, so you really have until 7:20 pm. If it takes you three hours to be seated and served at BOG, something is terribly wrong! We always schedule about 90 minutes for TS, which puts you around 6:00 pm, giving you plenty of time to get to Splash. If you have worries, you could always try modifying the FP+ about 30 minutes or so later.