Blade : 3-4 months
Rubbers : 3 days - 1 week
Another fun fact is that Cho Seungmin is a dhs sponsored player. He's using a full dhs setup. Another person also asked his current setup and it's W968 with H3 BS on fh and H8 on bh (didn't mention the exact versions i.e, hardness,thickness, neo/non-neo, etc of the respective rubbers) But I'll add photos below for you guys to have some predictions.
I'm not surprise of how often they change their rubbers because I've once heard Zhang Jike even change his rubbers once a week during trainings and during competitions it depends of around once every one or two days and moreover, it makes sense that rubbers tend to wear out or deteriorate performance faster than blades do.
I've also read in an interview asking about the same thing (blade) to harimoto. Though I can't find the source no more.
――How long do you change the racket?
Harimoto: I will change it in about a year. At the Asian Championships in September, the humidity was so strong that I lost in the first group, so I changed to a spare racket before the next fourth game. The spare was newer so it was better against humidity. After that, I continue to use it.
What startled me is that some pros do change their blade more frequent eg like cho seungmin. I know players will differ from one another like their personal touch, whether or not they like to stick with an older setup because they prefer better feeling on it,even if they are being sponsor or not(maybe?). There's alot to talk about. I'd like to kindly invite other members here to discuss it too. Apology for a long post. Thanks guys