K 2599 mod question

Im wondering if you can change the duration the relays are activated. My current kits are activating for 1-2 seconds. I would like to have the relays activated for 5 or more seconds at a time. Im aware that you can change the intervals of each of the 3 timed settings by either the r1-r3 resistors or the overall time by on c2.

Im using these timers for halloween props. They work very well, but would be nice for more activated time.

Problem solved. After further study of the 555 specs, increasing the value of R4 from 22k to 100k increased duration of relays from 2 seconds to 6 seconds.