This will take about **2 minutes** to download dependencies plus between 5 and **15 minutes** to build in debug mode depending on the power of your processor. At this point, you built the *substrate client* (a kind of "shell" in which lies the runtime) and the default *runtime* itself. You can run a local blockchain with:
```bash
cargo run ----dev--tmp# here, --dev means --chain=gdev which selects the gdev runtime
cargo run ----dev--tmp# here, --dev means --chain=dev which selects the gdev runtime
```
When you see the logs, the blockchain is running and you can connect to it with polkadotjs app: [https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:9944](https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A9944). You should see blocks being added every 6 seconds. You can use Alice, Bob, etc test accounts to submit extrinsics.
