 				promise.should.be.an.instanceof( Deft.Promise )
 				promise = promise.then(
 					( value ) -> 
-						expect( now() - start ).to.be.closeTo( 100, 10 )
+						expect( now() - start ).to.be.closeTo( 100, 50 )
 						return value
 				)
 				return promise.should.eventually.equal( undefined )

				promise.should.be.an.instanceof( Deft.Promise )
				promise = promise.then(
					( value ) -> 
						expect( now() - start ).to.be.closeTo( 100, 10 )
						return value
				)
				return promise.should.eventually.equal( 'expected value' )

				promise.should.be.an.instanceof( Deft.Promise )
				promise = promise.then(
					( value ) -> 
						expect( now() - start ).to.be.closeTo( 100, 50 )
						return value
				)
				return promise.should.eventually.equal( 'expected value' )
