sdcard & NAND-Flash memory life is usually dependent on:

• temperature (too hot or cold may cause data loss)
• sdcard Flash cell type
• sdcard internal controllers' wear-leveling strategy
• sdcard larger capacities tend to spread out wear if mostly empty
• file-systems like F2FS on average have shown to improve operational life by 70% or more

SLC (Single Level Cell)

• Industrial uses
• 50k to 100k  write cycles

eMLC (Enterprise Multi Level Cell)

• noncritical industrial uses
• around 20k to 30k write cycles

eMMC as pSLC (a.k.a. 'pseudo-SLC').

• is usually just MLC flash configured to only use states 3 or 0
• around 20k  write cycles

MLC (Multi Level Cell)

• each cell holds 4 different charge levels per cell
• around 3k to 10k write cycles

TLC (Triple Level Cell or 3D cells)

• each cell holds 8 different charge levels per cell
• some TLC based SSD drives use SLC caching areas
• typically around 3k to 5k write cycles
• Warning: can be as low as 300 write cycles for some chips