Convert seconds to hh:mm:ss

Hope this helps

a!localVariables(
  local!hoursInDecimal: split(5565 / 3600, "."),
  local!minutes:split((todecimal("." & local!hoursInDecimal[2])*60),"."),
  joinarray({text(local!hoursInDecimal[1],"00"), text(local!minutes[1], "00"), text(round(("." & local!minutes[2])*60), "00")}, ":")
  /*time(local!hoursInDecimal[1], local!minutes[1] , round(("." & local!minutes[2])*60))*/
)

Conveniently you can also use Appian's  intervalds() function that converts the given time components into an equivalent time duration. Since you only have seconds, you can specify 0's for hour and minute values. e.g. intervalds(0,0,5565) will result 0::01:32:45.000. You can then apply specific formatting as needed. Code snippet be like -

split(split(tostring(intervalds(0,0,5565)), "::")[2],".")[1]