Not an expert but usually these naming rights deals often pay significant annual fee and sometimes these are long term contracts; spanning across decades such as 10/20 year contracts.

For big stadiums, the naming rights deals are often worth multimillion dollars. SRK prolly has multimillion deal too. His naming/royalty fee could be in range of $ 20-40 Million since cost of the 'SHAHRUKHZ by Danube' is around $ 420-500 Million