max_execution_time limit 90 sec

Hello, I’m facing the problem with generating xml feed. It causes the eroor max_execution_time limit 90 sec. I set lower Block Size for Products Query to 32. It helps a little, but it still causes the error very often. There is about 2 700 products in the shop. Our hosting company does not allow to set higher execution time limit. Any solution for that error without change the hosting?
Thank you!