I am trying to understand time dilation as a total newbie. This question is all about my trying to understand enough such that in a work of fiction an offhand comment (about FTL being a bit silly) makes sense.
If a ship were to travel for a period of say 25 years at a very modest speed such that time dilation is nominal (for this question, negligible too). Then, from the same destination, a ship was to travel at some speed a tiny fraction less than C (or even C, for simplicity) and catch up (in let's say a day) what would the experiences of the two crews be?
Obviously "ship B" would experience 25 years of waiting plus 1 day of travel before they meet. Would "ship A" experience 25 years plus 1 day, or much more time?
I found one answer which explained the complexities of the twin paradox well enough but that's not what I am looking for as I cannot use the answer to solve my own question.