Cap how long an instance can poll for

[david-crespo]

If you land on the instance page and it is stuck in a transitional state, I think it could be reasonable to give up after some number of seconds, like 30 or 60. I wouldn't want it to just sit there polling forever if left open in the browser. You can always click the reload button or refresh the whole page to kick it off again.

We could do something fancy like poll every second for 30 seconds, then every 10 seconds for a few more minutes, then every minute for however long, maybe forever.