Flight is around 8 hours westbound....depends on how strong the head wind is.
Returning to Glasgow should be around 6 and a half hours....or less depending on the tail wind.
When you say you are flying to Toronto with Globespan...is that the new Hamilton flight? If it is then be aware that you are about 60kms from downtown Toronto.
The aircraft that are coming in at the moment from Manchester to Pearson are 767s. Not sure if that will be the same in the summer