@Tony_Knors search the sketch for each of these:
Where they include +90 change each of them to say +5 (5 seconds)
And change line 75 from:
timer.setInterval(10000L, activetoday); // check every 10 SECONDS if schedule should run today
timer.setInterval(3000L, activetoday); // check every 3 SECONDS if schedule should run today
Every 3s the MCU will check if you have an event scheduled and action it but only once because the 5s setting is there to stop the trigger repeating.
You could change the 90 to 2 and the the 10000L to 1000L but that's probably overkill.