db.r6g.8xlarge is an Amazon DocumentDB size with 32 vCPUs, 256 GiB memory (AWS Graviton2). In US East (N. Virginia) it costs $4.21 per hour on demand ($3,073.01 per month) for Standard storage. It is sold in 34 regions.
Prices by region
USD per hour, Standard storage. Reserved prices are no upfront, standard. Cheapest on-demand first.