DD is two next week, she has 2 hours from around 12.30 in the day, we take her up for stories, etc at 7ish, and usually dp cuddles her for around 20- 30 minutes and she's off by 8. for the last couple of weeks though, it's taken nearly an hour. If we're out and about in the day, she might only have an hour's sleep and is fine til bedtime.
I think she might be in the process of not needing as much daytime sleep and was thinking of waking her after 1 1/2 hours to see if she nods off quicker at the end of the day. How much do your 2 year olds sleep in the day? she cut down to one sleep when she was 13mo, if that gives an idea of the kind of sleeper she is, she's sleeping til 7ish.