a good spell
1. A particularly fortuitous, beneficial, or productive period of time. The star footballer was out with an ankle injury for the first half of the season, but she's had a pretty good spell so far since she's returned. We were lucky to have had a very good spell right before the recession, so our business was able to weather the storm a little better than others.
2. A reasonably or relatively long period of time. Ireland is world-renowned for its cold, rainy climate, but we've had a good spell of sunshine and warmth this summer. You'll have a good spell of hard work ahead of you, but you'll get paid very well at the end.