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I have seen them drop domains as soon as 21 days after the expiration date, but they also hold a lot of names for months and months after expiration just like Netsol.
I just transferred the rest of my domains away from them. Not bad if you want free webhosting (cgi/stats/unlimited) with a domain registration for ($35/yr). You get a good stats program too. I hosted a domain on there for 2-3 years without having to pay for a real webhost.