I have some critical photography ($3,000 gig) coming up and I use a dual slot A7III camera, and I have 4 64GB memory cards, and I'll be using 2 at a time, but they're all about a year old and I've used them casually, writing and deleting maybe 20 GB per month on them.
How many write cycles would a brand name Samsung SD card last through? Online said about 100,000 cycles but I'm not sure I believe that. I figured computer people would know better than photographers.