[plt-scheme] Setting timeslice for the thread in the embedding application

Is there way to increase the time, that scheme_check_threads() can consume?

-- 
Sergey Khorev
http://iamphet.nm.ru
"He thought he saw a Banker's Clerk
   Descending from the bus:
He looked again, and found it was
   A Hippopotamus:
'If this should stay to dine,' he said,
      'There won't be much for us.'"
 -- Lewis Carroll, "Sylvie and Bruno"