The physics here are beyond simple.
1ml of water requires 4 watts of cooling to drop 1 degree C.
Thus: 30ml x 4W x 33c = 3.96kW (IE cool 30ml by 33c needs 3.96kW of cooling)
The TEC01-02015 spec sheet shows that at even the meager 12V output at max amps available, shows 33c is the rated dT and the Qc is 100 W. It does not say Qc is per per hour or per minute, so we assume it is constant.
3.96kW divided by 100 W/s = 39.6s OK. Round to 40s.
The TEC is well cooled... the cold side is showing -17c in the aluminum water container attached to the cold side.
WHY can't we simply cool 30cl of water without it taking an hour or more? Yeah, sure, there are losses to the ambiance and to the container holding the water (aluminum). What else are we doing wrong?