to last  - durar, aguantar, sobrevivir, bastar 

to continue  - continuar, seguir, proseguir, prolongarse, durar, reanudar, reanudarse, prolongar 

to prolong  - prolongar 

to extend  - extender, tender, extenderse, prolongar, prorrogar, agrandar, ampliar, aumentar, dar, ofrecer 

to lengthen  - alargar, alargarse, crecer, prolongar, extender