docs: add build limits section to templates quickstart (#240)

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

Author: mintlify[bot]

docs/template/quickstart.mdx

@@ -238,3 +238,15 @@ sbx = Sandbox(template="template-tag")
 <Note>
 The template name is the identifier that can be used to create a new Sandbox.
 </Note>
+
+## Build limits
+
+Template builds are subject to the following limits:
+
+- **Max build duration**: Builds can run for **up to 1 hour**. If a build exceeds this, it will be terminated.
+- **Max vCPUs per build**: 8 on Hobby, 8+ on Pro, custom on Enterprise.
+- **Max memory per build**: 8 GB on Hobby, 8+ GB on Pro, custom on Enterprise.
+- **Max disk size per build**: 10 GB on Hobby, 20+ GB on Pro, custom on Enterprise.
+- **Concurrent builds**: 20 on Hobby and Pro, custom on Enterprise.
+
+See [Billing & limits](/docs/billing#plans) for the full list of plan limits. Need higher limits? Contact [support@e2b.dev](mailto:support@e2b.dev).