It won't take you X cycles to regain your strength. That's not how training and using a TM works. The TM and submax training is a tool. When used appropriately, it is used as a way to build your strengh NOT test your strength. Use the appropriate TM for your current strength, use FSL work for some extra volume. Patient progress yields fast results. I have seen it too many times to be a coincidence.
There is a reason why when we test people in our gym - they all use TM well below where they test. For example, a few weeks ago we had a guy test his deadlift as part of his sixth week. After doing his PR set, we worked up to 425 for 5. His TM is 365.
In the beginner realm, we had a guy who was in sixth week. Again, after his PR set on squat, he worked up to 185 for 6. His TM was 145.
All do 5's PRO, FSL for 5x5-10 (depending on where they are in training cycle) and a few assistance movements. Both train 2 times a week: squat and bench on one day. Pull and press the other. Box jumps/mex ball throws are done on both days. Peowler is done as long as weather is appropriate (no snow or ice and it's not below freezing). Sixth week is reserved for PR work and occasional Jokers.