How much is a bench warrant if he had it for more than five years and how would he pay it?

Bench warrants are set by the judge. The could go from about $2,500 to no bail, for murder or a probation violation which means the bail will not be set until he appears.

You don't pay a bench warrant. To handle a warrant properly, you must turn yourself in to the issuing court, with or without an attorney. On felony charges, the defendant must be personally present at every court hearing and appearance. On misdemeanors and infractions, an attorney can appear in court without the defendant being present which is safer and avoids immediately being taken into custody. You'll try to negotiate a recall of the warrant[s] and bail reduction or OR release. You'll try to negotiate a plea bargain on any Failure to Appear charge or probation violation that caused the warrant. You'll try to negotiate a plea bargain or take to trial the outstanding charge that caused the warrant. Effective plea-bargaining, using whatever legal defenses, facts and sympathies there may be, could possibly keep you out of jail/prison, or at least dramatically reduce it, and may enable you to get your probation and programs reinstated. Unless you're competent to effectively represent yourself in court against a professional prosecutor trying to put you in jail, most people hire an attorney who can.