ffmpeg, need help to make small thumbnail slideshow video from long video

With ffmpeg command, I am trying to create a small thumbnail slideshow video of a large video
by selecting one frame every 60 seconds and then combining those frames to make a video in a way that each selected frame would show for 2 seconds.
I am using this command:

ffmpeg.exe -i "D:/input-video-1.mkv" -vf "fps=(1/60),setpts=N/FR/TB,scale=-2:240,fps=(1/2)" -an -sn -dn -y "D:/output-3.mp4"

But when I play the output video, one frame takes the entire video and output video length is also incorrect.
Please help me to fix this issue.

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