I have hosted a simul at our house last Sunday against 5 players who were friends and acquaintances of mine. It was fun, but it took a bit too long, because I allowed everyone to use as much time as they wanted, plus, the players' wives and girlfriends were sitting around, chatting with some of the players and after the event we had pizza etc.
We started around 2h30 pm and it ended at 7h30. Therefore, I decided that next time I will use clocks, I already looked online for suggestions and found out that, even an International Master with a rating of 2500 for example has 10 min more on the clock than the participants. So, if I play against two players of similar strength (1500) and three others who are around 1000 - 1100 - 1200, I feel I should adjust my extra time to their strength as well.
What are the normal guidelines for using clocks in simuls?