In my personal experience, it's most useful (for me, this will be individual to each person) to do statics in series of 3-4 days, and then rest 2-3 days. I'm speaking in terms of performance. It may not be useful to your general health, be vary of that.
The biggest leaps in performance seem to come after a long training period followed by a relatively long rest period. For example training really hard for 2-3 weeks, then rest one week and once I start training again, boom, pb's shattered. So make sure you take some time resting totally once in a while.
I think once or twice a week will bring great improvement. But you have to try different things and see what works. One week you might do them in a row (mon, tue, rest of week resting), another week rest in between etc.
If you try more than 2 statics per week, make sure you rest well (sleep enough) and eat healthy. Also listen to your body. After a particularly long stint I at least start having trouble sleeping, my stomach starts acting up, lowered immunity etc...If you keep going, these get worse and worse until you find that the lack of sleep, proper nutrition and dehydration or whatever (caused by the stomach problems) will lead to a state of "static burnout" and you can't keep going anymore.