Is it enough...well, it kind of has to be...I can't imagine doing much useful lifting after 100 deads. Maybe alternate between 10X10 deads and a more complete back routine every other back day.
As for how long to keep the routine...I personally think it's beneficial to change things up every couple months...maybe even sooner for something extreme like this. It sounds like something you throw in for a few weeks every now and then for a "shock".
What are you looking to accomplish with this routine? Size, definition, endurance? Let us know how it goes...