Ciao breaststroke2005 e benvenuto :)
potresti convertire tutto in secondi, ad esempio 1.05.43 = 65.43, e poi memorizzarlo in un campo di tipo decimal.
Dal manuale di MySQL (http://dev.mysql.com/doc/mysql/en/numeric-types.html)
The DECIMAL and NUMERIC types are implemented as the same type by MySQL. They are used to store values for which it is important to preserve exact precision, for example with monetary data. When declaring a column of one of these types, the precision and scale can be (and usually is) specified; for example:
In this example, 5 is the precision and 2 is the scale. The precision represents the number of significant decimal digits that are stored for values, and the scale represents the number of digits that can be stored following the decimal point.