TPS3899: Can TPS3899 support 20s/50s delay time?

dears,

My customer is seeking for 20s and 50s delay watch dog, i'd like to recommend TPS3899 for lowest cost, but according to the datasheet, the max delay time is 6.2S with 10uF capacitor used, but according to the working model and the calculation express: tD = 654666 x CCTR_EXT + 80µs,  i am wondering if we may use 30uF to get 20s delay time?

or TPS3851 should be a most optimized solution for the application?

thanks a lot!