Do you need the date information or just time? If just time, you could
use:

=TIMEVALUE(RIGHT(A2,8))*24 which gives an answer of 11.096 (I'm not
sure where your 11.08 is coming from)

If you need the date info, extract it with the following:
=LEFT(A2,FIND(":",A2)-1) .

That should get you started.

- John