u/Affectionate-Baby576

I recently got a new to me 21 Elantra and had the first recommended oil change, per the sticker in the windows. I have never paid much attention other than noticing when it's getting close to the milage number. Today I noticed that the recommended milage is 15k miles and 6 months away, is that accurate? Change was done at the dealer, but tgat just seems extreme to me. Mentally I'm still a 3k/3 months mentality, but have things improved that much?