If you dedicate 2 gigabytes of it to the .cache folder than either it's going to be mostly empty and you're be causing more thrashing as the kernel unloads stuff it didn't need to, or it fills up and your system falls over when something tries to put a big temporary file in that folder.
About weekly the longest.
Would you agree with this article's recommendations regarding ramdisk setup? https://www.linuxbabe.com/command-line/create-ramdisk-linux There seems to be controversy in the comments as to whether tmpfs is a proper ramdisk - although no clear tutorial as to a better method. Interested to learn more!
In this case I'm just using tmpfs as outlined in your link. Keep in mind tmpfs can actually swap when out of space, if that matters to you.
SSDs can handle a lot of writes. That is not necessary to do.