How long has it been taking? Can I assume I've cleared the review process if it has been 3-4 days?
Widestrides, approval turnaround time varies widely with volume, and also depends to a certain extent on when you submitted your ads. So, while we certainly try to get ads reviewed as quickly as possible, there is certainly a chance that your ads will not have been reviewed after 3-4 days. If you're concerned, then contacting AdWords support is a good idea, as suggested by Robsp.
Ads are reviewed on a very limited basis on Saturday and Sunday - and Mondays are often very high volume days. So, if, for example, you were submit new or edited ads late on a Friday evening the very earliest they would be reviewed would be Monday morning, or roughly two and a half days at the minimum.
For this reason, whenever you have the choice, you may wish to submit new or edited ads mid week. This'll probably improve your turnaround time.
AWA
I'm happy and even happier if it is likely that after 5 days now, no disapprovals - just one grammatical disapproval has come through. But I thought that one might have been automatically scanned and disapproved and that I still might have to get reviewed by a human editor.
Thanks.