OK, at all sounds perfectly normal.
No offence, but there’s a limit to how much you can expect for free. They are working those hours after all and, sadly, they have to guard against the small minority of parents who would grab unlimited free hours of settling sessions if given the chance.
If you do think more sessions are needed, discuss this with the manager. They should be able to accommodate your request, but be prepared to pay for the additional time.
TBH there is no 'right' formula for settling in, even though settling in sessions are frequently seen as some sort of 'magic bullet'. I just don’t think the child development 'experts' know as much as they like to think.
Some children settle immediately, other takes months or never truly settle (some still cry in Year 3 at school.) It's quite common for a child to settle well, then go through a later period of becoming unsettled.
And short sessions don’t replicate the reality of mum being away for up to ten hours when she first goes to work.
I have a strong suspicion settling sessions do more for the parent than the child, in terms of getting used to separating.