[chuck-users] good until loop

Would anyone mind sending a good example for loop "until" ? I simply want a shred to stop automatically after a 10 seconds. Here is what I wrote: do{ Std.rand2f(200,50.0) + Math.sin(v*100.0)*20.0 => v2 => f.pfreq; Std.rand2f(5000.0, 60) + Math.sin(v*30.0)*80.0 => f3.pfreq; Std.rand2f(1500, 80.0) + Math.sin(v*200.0)*50.0 => f2.pfreq; std.rand2f(.551,.549)=>buf.rate; .0+(.9*maybe)=>buf.gain; 0=>buf.pos; .1:: T =>now; } until (5::second); thanks so much! -tim