My husband and I usually pray in Jamaat at home. If one of us is not available right at the time of prayer, how long should the other wait to pray in Jamaat rather than alone?
Bismihi ta'ala
If it would be within a reasonable range of time after the entering of the prayer time, then yes you can wait, and you will receive the reward of prayer on time, and also jama'ah prayer.
However, if there will be an extensive delay, then it is better that you pray on time, and receive its abundant reward.
And Allah knows best.