But combining Credit Suisse into UBS could take much longer, potentially months, because the deal needs approval from regulators in tens of countries, the people said, seeking anonymity given the sensitivity of the matter. Spokespeople for UBS and Credit Suisse declined to comment. The longer the deal takes to close, the harder it will be for Credit Suisse to hold on to its business as the uncertainty erodes confidence in the lender. Bank of America's electronic stocks desk had halted trading with a desk at Credit Suisse that uses computer-led strategies, an email seen by Reuters on Monday said. Bloomberg News reported on Thursday that Wall Street banks and European firms are lifting hiring freezes to lure staff from Credit Suisse.

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