Candidates are selected for the ASI Post and join the CISF then you are liable to get promoted to the rank of sub Inspector, basically after five years of continuous service. The Promotion of the candidates ASI to SI are carried out on the basis of Zonal Security and candidates have very little chance of getting your first promotion before at least 7-8 years of service. Candidates can get promotion on CPO SI ASI Post with the departmental exams as well to fast track the process.
SSC CPO Career Progression:
There are departmental exams and rank calculate comes play for advancement.
SI in Delhi Police:
Once the aspirant of SSC CPO exam joins Delhi Police as Sub-Inspector, will get first promotion usually after 15-18 years to the post of Inspector. Your next promotion of ACP can take 12-15 years thereafter. But there are number of factors on which the promotion depends like number of vacancies, work profile etc.
SI in CAPF:
Sub-Inspector promotion in CAPF, then there are different criteria for all the forces included, like in BSF there are promotion examinations that you have to clear in order to get promoted.
ASI in CISF: Assistant Sub-Inspector promotion in CISF, it can take basically 5 years of continuous service to get promoted to the rank of Inspector. But the chances are few as the promotional exercises are carried out on the basis of zonal security.
So, mostly it takes 7-8 years for the first promotion. Departmental exams and seniority factor comes into play for promotion.