SAN JOSE, Calif. — Jurors were set to begin their second day of deliberations today in a multibillion dollar patent infringement case pitting Apple against Samsung over the design of iPhones and iPads.

After a three-week federal trial in San Jose, a jury of seven men and two women will try to decide if Samsung Electronics ripped off Apple designs or whether Apple wronged Samsung.

With so much money and market clout at stake, few experts were expecting a quick verdict. A decision likely won’t come anytime soon, according to jury experts, attorneys and courtroom observers.

“This case has huge implications,” said University of Notre Dame Law Professor Mark P. McKenna. “It could result in injunctions against both companies” involving the sales of products.

It took the judge more than two hours to read the 109 pages of instructions to the jury. As a verdict is reached, jurors must fill out a 20-page form that includes dozens of check-off boxes.

“The verdict form is crazy,” said Karen Lisko, who runs a jury consulting company that specializes in patent trials. “It’s incredibly complicated.”