We also have a FP+ for this for the 4:10 show. Our FP arrival window is 3:40-4. We have a TSMM FP booked for 4:50-5:50. We figured the show is 38 mins. so we will hopefully get to TSMM somewhere around the beginning half of our arrival window. There were other shows, rides etc. we tried to book with tight times and the FP system wouldn't let me do it. So, since for this show and then TSMM it let me, I presume we will have time to make it to our TSMM, but stranger things have happened to us at Disney, (like a FP+ for TSMM that took over 90 mins. due to a glitch) so we will just hope for the best!