is there any flexible wait statement

Hi



i set the default proj wait time to 60 sec. but for few obj i just need to wait for only 5 mins. i used the following methods

1. exitsts:

   it waits for the default proj time. it does not accept like exists(5)

2.waitproperty

  this also takes default proj time irrespective of wait time i give. also if the obj does not exists then execution stops.



i use TC 8. can someone give a method to check existence of an obj for a flexible time i wish.



Thanks in advance