How to create a Countdown Timer for longer than 1 minute in PowerPoint

I understand slide transition is taking 1 minute and 2 seconds of time (Delay time 60 seconds and duration time 2 seconds) not exactly 1 minute. Please make me understand about this. Thanks

how can I apply when I have video and text in one slide; that is, video is for 3 mins. I have to change the text 3 times.(I mean the video song lyrics are written in one minute each for 3 minute video.)

How to increase the slide time beyond 59 seconds while using the motion path option to move the text in upward direction? Also How to reduce the speed of the text moving in upward direction?
Can you please reply.

GREAT VIDEO