See, this is why I have a calendar on my wall.
Or you could add your purchase to your daybook app, to remind you about deadlines as well as dentist appointments.
Sometimes we have to take responsibility for ourselves.
Why 25 days btw? You have up to 45 days to open a Dispute although most will encourage you to open it no later than Day42.
If your item is coming from Asia, 30 days is a reasonable wait, unless you paid for Air Mail.
From Europe 7 to 15 days.
From Canada or USA allow 15 to 20 days.
It could take less, but those are in my experience ample.