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Yeah, it's not a ton of time. However, the next tier is $25 for 5 hours each day.
And then it goes to 8 hours after that, but I'm not sure how much per day.
But, if you can't afford a Mac and you want to start learning to dev iOS apps it could be pretty nice.
I tried this service last year and wasn't impressed; I hit periods where high usage meant that it wasn't responding as rapidly as I would have liked. To be honest, you can pick up a Mac Mini for next to nothing so why not go that route instead?