The amount of points you keep is set per job. If you set it to 14 you have 1 full + 13 incr, set it to 100 and you get 1 full + 99 incr.
We won't keep making backups until the disk is full (unless you define too many restore points)
. We automatically merge the oldest incremental in the full file when reaching the defined number (if it is 7 we will do a merge on day 8 and merge the incremental of day 2 in to the full backup).
If you use synthetic full & active full the same applies in regards of the total points configured in your job.