Getting back on form with Tactics?

Back in February and March, I was performing at a decent level for tactics on ChessTempo (Around 1900 for me.) However, I basically phased out of chess for the past few months due to my heavier workload and lack of interest. As a result, I have been extremely inactive and doing essentially nothing in terms of improving my chess. Over the past few weeks or so, my time has freed up a bit and I have been doing quite a few tactics. Although I expected to be rusty, I expected the jump back up to 1900 to take at max a week. Currently I am still struggling with ~ 1700 tactics after 2-3 weeks of daily tactics sessions. For other chess players, how long until I see improvement in my form? It's really frustrating to be unable to break this plateau.