The trouble is that the parent o/s will sometimes never give that USB device to the child o/s. If the parent has set up to pass the device to the child o/s, then it does so relatively quickly. Adding a delay for how long before timeout won’t change anything.
There are times when removing and reinserting the USB cable will trigger re-enumeration, but this is a manual step (a workaround) which would not change by adding a timeout…it would still wait for manual intervention when the parent o/s does not properly pass USB through to child o/s. The flash software cannot control or talk to the parent o/s, and thus there is no way for NVIDIA to provide VM support. This is however something the tech support of the VM company can help with.