Increased workload, Do I need to change workout?

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Due to a couple of staff members at work quitting I'm having to pick up a few more hours (totaling around 60-65/week from the 35ish I was doing before), so wondering what to do with my program.
at the moment I'm doing the following:
#1 chest/back
#2 quads/hams/calves
#3 bi/tri/shoulders
#4 rest

Then I usually just repeat that.
But my question being if i stick to that with the increased workload etc, will this be efficient time to recover before the next workout? (muscles/cns?)
Or am I pushing it a little?
Other thought I did have was to add a second rest day, but is that putting too much time between say chest workouts etc?

Thanks Guys