bad idea,
with current rise in difficulty ...
on desktop i3 I have about 20kH, depending on your proc it will be similar
plus the problem with heat
and also don't try to use notebook graphic card like 7970m (it's actually more like desktop 7870)
it has TDP approximately 100W and during mining you will use them all
probably they don't expect in the notebook design using it at 100% 24/7