2008 Holden rodeo 4JJ1

My 2008 Holden rodeo 4JJ1 is taking way way more cranks than usual to turn over. Usually in the very first start of the day it starts within the first crank or two but the second time I start it, it takes like 10 cranks. I was thinking it could be worn out glow plugs but the fact it starts fine first start in the morning kind of rules that one out.