I don't think 10 months is a long time, Bec. Just from what people have said here, I think it's really up to the baby.
Gabby sleeps soooo well when she is wrapped. Half the time I just have to wrap her, put her down and I don't hear a peep out of her for a couple of hours!
The way I figure it, if it ain't broke, don't fix it!
I'll worry about trying to get her to sleep unwrapped once her motor skills are more developed (which will hopefully coincide with the warmer weather).