On a long contract, is it ok to ask for a raise?

devcore

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Aug 9, 2018
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#1
It's been a 9+ month paid per-hour, per-project at a flat rate. Now it's become a contract-to-hire with an undefined length of time. I have learned a lot of new skills during the last 6 months, and feel my pay rate could potentially increase. At what point in time, or in learned skills, is it considered ok to ask for a pay increase?