If you deposit and withdraw the same amounts with no delay you diminish the value of mixing.
I am almost sure that the engine doing the mixing is not down (I expect its uptime not being related to onion, instead related to bitcoin network and some machine running 24/7 in the cloud).
On top of that... the ChipMixer paradigm is based on creating a session that terminates after 7 days. Meaning... if I create a session and deposit some bitcoin I need to preserve the chips or withdraw the BTC within 7 days.
I guess that OP, when he's back, can easily handle that (and also give more insightful answers too).