A wake whose host does not answer fails within about a minute

A paused sandbox whose host did not answer its wake used to stay in resuming for as long as the host stayed silent, and every request on it waited. The wake now gives up after two unanswered attempts (about a minute): requests on the sandbox return 500 operation_failed immediately, its memory and files are kept, and nothing is charged. A minute later the host is asked again; once it answers, the sandbox is paused and the next request wakes it.