In conclusion

• lastly
• last
• conclusively

After a considerable length of time, usually after a delay

• ultimately

As though a matter were settled

• in-fine
• beyond the shadow of a doubt
• for-good
• once-and-for-all
• assuredly
• enduringly
• determinately
• for all time
• permanently
• past regret
• beyond recall
• definitely
• irrevocably
• certainly
• in a final manner
• with conviction
• with finality
• decisively
• conclusively

After a long period

• as it may be
• in spite of all
• in the crunch
• at the eleventh hour
• as things go
• as the world goes
• late in the day
• in-the-long-run
• when-all-is-said-and-done
• belatedly
• tardily
• at the last moment
• at the final point
• at-long-last
• despite delay
• as a sequel
• after a while
• after a time
• after-all
• lastly
• in-conclusion
• subsequently
• ultimately
• eventually
• at-length
• at the end
• in-the-end
• at-last