That's according to stats from Greystripe's mobile ad network.
Free iPhone apps are accessed an average of 19.9 times over their lifecycle before being discarded by users, with an average engagement of 9.6 minutes per session.
The stats are from Greystripe's latest quarterly metrics report and are based on data gleaned from the 600 free iPhone apps and games in its ad network.
Overall, the US accounts for 74.8 per cent of Greystripe's iPhone ad traffic, followed by the UK, Canada, Australia, France, Singapore, Japan, Hong Kong, Mexico and Germany.
Michael Chang, CEO at Greystripe, said: "The biggest question about iPhone applications for brands and publishers centers around market size, revenue and usage. We are right in the middle of all three questions and we believe our Insights Report brings more light to this booming business."
To view the full Consumer Insight Report from Greystripe, click here.
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