This is only if you choose to run a core node locally. Not all user will do so, and for them, they will be up and running in a couple minutes. The bitcoin bloc

This is only if you choose to run a core node locally. Not all user will do so, and for them, they will be up and running in a couple minutes. The bitcoin blockchain is just the current blockchain being used. Blockstack was built to be migratable to any blockchain. In fact, they've already migrated once successfully.