If the timer were to be removed though, i'd have to thoroughly insist on raising the price of each pet no less than 5x its current. As it stands, i think it would honestly be good to reduce red coin drop rate and possibly up the prices a bit.
Coins are ridiculously easy to obtain, and the only time you normally keep pets out to the expiration limit is when you're training the pet, doing generations, or doing exploration in an area with the chests/artifacts spread way the flip out. And you normally only do that last one, for something like a skill book, so it's usually limited to one or two days out of a week, to obtain the book and then you're done with it. Generations and even pet training are similarly restricted, in that you do them basically one time, or for a set period of time, and you're done. So running out of time shouldn't normally be an issue unless you're going to try to afk with your pet out. (i've done that a time or two on live unintentionally)
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Discord: Tonkatunk#7079
https://github.com/Tonkatunk/Mabi-Pro-Lazyfae-Mods