I can only say this is not universal; my Inforad usually comes on in a minute or so. Assuming the instrument is properly placed and there is nothing odd about the windscreen glass, it may be faulty.
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There are two main types of fix. A hot fix and a cold fix.
Hot fix. - GPS has not moved since it was last turned on, has a good signal, and therefore on power up does not have to work hard to confirm & fix position. Time approx 30 seconds.
Cold fix - thinks its never had a fix before, does not know what part of the world its in, signal is variable, lots of work to do to confirm postion. up to 5 mins - sometimes more.
I suspect, given the price, the inforad does not have a very good gps implementation (sensitivity and firmware), and the owner my have poor reception.
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