I’ve been eighteen months in my current job and still feel like it’s a new job I’m trying to get to grips with. There are several reasons for this, including the fact that my role covers many different areas and the tasks themselves can vary enormously. However covid has made it much worse because I spend a lot of time working alone, and because the colleague who is my official mentor is fairly unapproachable, so I don’t ask as often as I otherwise would. I’m also working in a language that isn’t my mother tongue, and with systems I’m less familiar with, because I’m not in my home country.
That said, I’ve had lots of other jobs in the past, and usually I slide into them quite easily after a month or two, even if some of those complicating parameters were still there.
So… it’s very job and situation dependent, I’d think. Maybe try to work out the specific aspects that might be making this job difficult, and whether they are something you can tackle, or which might change (covid, for example). Then you can try to work with it, or decide to move on, if that’s possible.
I can’t move on, at present, for reasons external to the job, so I’m just doing my best and hoping nothing goes too seriously wrong before I have the chance to reassess.