My boas can stay in food mode for a day or two, easy.
Do not be tempted to feed again too soon. Boas could eat every day, but it would be terrible for them. They have a slow metabolism (even compared to other snakes) and have a tendency to get too heavy and have health issues.
Less is more when it comes to food for them.
If you have questions on a feeding regiment for them, just ask. There are different opinions, but mostly about whether to feed an appropriate meal infrequently or more infrequently compared to most other snakes.