Levelling is really easy in PSO2 if you know what you're doing. If all you do is just play content and maybe recommended quest 4, then yes it takes a while.
All I did was do my dailies/weeklies on alts until I got the gold key, then just ran all my golds every Saturday. I didn't even do recommended quests for those keys, just the Arks Mission ones.
I skipped PSO2 days as well unless they happened to land on a weekend as I didn't really want to be rushing keys after work. Got to level 100x13 on Feb 22 with the second Ultra PSO2 Day.