My team added something four weeks ago that might be an idea to try - we're still trailing it ourselves. It started accidentally and became a tradition on our team though so your mileage may vary.
If the pull request is small, fixes a bug or is a blocking you, then you can spend you quick-code-review-chip for the week and ask the team to look at it at their first available opportunity. (Sometimes reviewed within 15 minutes, usually an hour tops)
It allows team members to ask the rest of the team to unblock them quickly. Limiting it to one a week prevents abuse of their team mates' time and encourages all team members to plan their work out ahead as to reduce blocking.
We also wrote a quick HipChat bot that keeps track of who's spent their quick-review-chip too.
If the pull request is small, fixes a bug or is a blocking you, then you can spend you quick-code-review-chip for the week and ask the team to look at it at their first available opportunity. (Sometimes reviewed within 15 minutes, usually an hour tops)
It allows team members to ask the rest of the team to unblock them quickly. Limiting it to one a week prevents abuse of their team mates' time and encourages all team members to plan their work out ahead as to reduce blocking.
We also wrote a quick HipChat bot that keeps track of who's spent their quick-review-chip too.