Announcing staging environment of TTN Back-end 1.0

Concerning downlink and mqtt...

Is it correct to use the following value to tun the ttl? :

• "e.g. for a ttl == 1 hour (ok is coming from the wiki)"
  {"payload":"SGVsbG8gd29ybGQK","port":1,"ttl":"1h"}

• "e.g. for a ttl == 1 minute"
  {"payload":"SGVsbG8gd29ybGQK","port":1,"ttl":"1m"}

• "e.g. for a ttl == 1 second"
  {"payload":"SGVsbG8gd29ybGQK","port":1,"ttl":"1s"}

Tks!