Delays / waits in Direct Method / Device Twin Callbacks (CA-269)

[SputnikTheMighty]

I've noticed experimentally that within the device twin callback, delays cause crashes. However, within direct method callback, this seems to not be the case. Is it bad practice to have delays within a direct method callback? For example, waiting on a queue to receive some data.

According to Azure, a direct method response can take up to 300s, but I assumed that you can't have the Direct Method handler have a 5 minute delay inside it.